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Topic: Blending inheritance

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal
		Charles Darwin proposed a theory of evolution in 1859 and one of its major problems was the lack of an underlying mechanism for heredity.
		The inheritance of acquired traits was shown to have little basis in the 1880s when August Weismann cut the tails off many generations of mice to find that their offspring did continue to develop tails.
		It was initially assumed the Mendelian inheritance only accounted for large (qualitative) differences, such as those seen by Mendel in his pea plants — and the idea of additive effect of (quantitative) genes was not realised until R.A. Fisher's (1918) paper on The Correlation Between Relatives on the Supposition of Mendelian Inheritance.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=heredity (878 words)

	Mendelian inheritance - Wikipedia, the free encyclopedia
		Mendelian inheritance (or Mendelian genetics or Mendelism) is a set of primary tenets that underlie much of genetics developed by Gregor Mendel in the latter part of the 19th century.
		Before Gregor Mendel formulated his theories of genetics in 1865, the prevailing theory of biological inheritance was that of blending inheritance, in which the sperm and egg of parent organisms contained a sampling of the parent's "essence" and that they somehow blended together to form the pattern for the offspring.
		Mendel proposed instead a theory of particulate inheritance, in which characteristics were determined by discrete units of inheritance that were passed intact from one generation to the next.
	en.wikipedia.org /wiki/Mendelian_inheritance (773 words)

	Blending inheritance - Wikipedia, the free encyclopedia
		Historically, this was a short-lived 19th century "arm-chair" biological theory of inheritence, primarily discredited by the experiments of Gregor Mendel.
		It is similar to the modern idea of incomplete dominance in that the offspring will express a blending of the different traits of the parents.
		However, while incomplete dominance only expresses this blending in the phenotype, keeping the alleles within the heterozygote distinct (and, thus still inheritable in successive generations), the theory of blending inheritance referred to an actual blending of the genetic material (i.e.
	en.wikipedia.org /wiki/Blending_inheritance (238 words)

	Search Results for "blending"
		...The blending into one syllable of two successive vowels of adjacent syllables, especially to fit a poetic meter; for example, th' elite for the elite.
		...Genetics The inheritance pattern of a system involving incomplete dominance, whereby characters are inherited in heterozygous individuals that show the effects of...
		Incapable of associating or blending or of being associated or blended because of disharmony, incongruity, or antagonism: incompatible views on religion.
	www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=col61&x=10&y=12&query=blending (367 words)

	Encyclopedia: Heredity (Site not responding. Last check: 2007-10-26)
		Heredity (the adjective is hereditary) is the transfer of characters from parent to offspring, either through their genes or through the social institution called inheritance (for example, a title of nobility is passed from individual to individual according to relevant customs and/or laws).
		Blending inheritance would lead to uniformity across populations in only a few generations and thus would remove variation from a population on which natural selection could act.
		The inheritance of acquired characteristics was shown to have little basis when August Weissman cut the tails off mice to find that their offspring did develop tails.
	www.nationmaster.com /encyclopedia/Heredity (406 words)

	Intro to Genetics
		Blending theories of inheritance supplanted the spermists and ovists during the 19th century.
		He was forced to recognize blending as not important (or at least not the major principle), and suggest that science of the mid-1800s had not yet got the correct answer.
		The patterns of Mendelian inheritance explained the perseverance of rare traits in organisms, all of which increased variation, as you recall that was a major facet of Darwin's theory.
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookgenintro.html (2465 words)

	Mendelian inheritance (Site not responding. Last check: 2007-10-26)
		Mendelian inheritance (or Mendelian genetics or Mendelism) refers to the primary tenets that underlie much of genetics developed by Gregor Mendel in the latter part of the 19th century.
		Mendel (1822-1884), an Austria n monk, was interested in understanding variances in plants, and between 1856 and 1863 cultivated and tested some at [http://www.netspace.org/MendelWeb]) that was read to the Natural History Society of Brunn on February 8 and March 8, 1865, and was published in 1866.
		Introduction to inheritance planning A guide from the BBC on the basics of planning for inheritance tax.
	www.serebella.com /encyclopedia/article-Mendelian_inheritance.html (1011 words)

	Evolution - A-Z - Atomistic (Site not responding. Last check: 2007-10-26)
		As applied to the theory of inheritance, the term atomistic describes inheritance in which the entities controlling heredity are relatively distinct, permanent, and capable of independent action; Mendelian inheritance is an atomistic theory because, in it, inheritance is controlled by distinct genes.
		The alternative, and historically older, theory is that of blending inheritance.
		This is the factually erroneous idea that organisms contain a blend of their parent's hereditary factors and pass that blend on to their offspring.
	www.blackwellpublishing.com /ridley/a-z/Atomistic.asp (90 words)

	Blending inheritance - Article from FactBug.org - the fast Wikipedia mirror site
		Historically, this was a short-lived 19th century "arm-chair" biological theory of inheritence, primarily discredited by the experiments of Gregor Mendel.
		It is similar to the modern idea of incomplete dominance in that the offspring will express a blending of the different traits of the parents.
		However, while incomplete dominance only expresses this blending in the phenotype, keeping the alleles within the heterozygote distinct (and, thus still inheritable in successive generations), the theory of blending inheritance referred to an actual blending of the genetic material (i.e.
	www.factbug.org /cgi-bin/a.cgi?a=1617618 (260 words)

	NCSE Resource (Site not responding. Last check: 2007-10-26)
		Darwin was always aware of the difficulties that blending inheritance would cause for natural selection but he was also aware of other evidence, prepotency or dominance and reversion, which presaged Mendel, along with the ubiquity of individual differences which animal and plant breeders used so effectively.
		After reading in 1867 Jenkin's criticism that random variation would not be sufficient to replenish the variation lost through blending inheritance, Darwin gave added weight to use and disuse and Lamarckian effects of the environment as mechanisms producing variation and downplayed the importance of "single variations", what we would call mutations (see Denton, 1986, p.
		It is blending inheritance that produces a phenomenon similar to conservative or stabilizing selection.
	www.ncseweb.org /resources/articles/8206_53_sonleitner_what39s_wr_11_24_2004.asp (6786 words)

	William Wimsatt (Site not responding. Last check: 2007-10-26)
		Discussions of blending inheritance tend to focus on (and often to misunderstand the significance of) the second, although the first is in many contexts even more important, and not at all affected by the transition between blending and Mendelian theories.
		To see what blending inheritance does to the amount and nature of variation in a population, imagine a physical analogue for a model population with "blending" inheritance: this is a population of indefinitely large size (so there will be no "sampling error" effects) which consists equally of beakers of clear (W) and red-colored (R) water.
		With this blending inheritance model, there is no natural distinction between genotype and phenotype, since both correspond to the amount of red-making material (or proportion of dye particles) in the beakers.
	www.virginia.edu /philosophy/uvachi/wimsattp.htm (5611 words)

	Articles - Heredity (Site not responding. Last check: 2007-10-26)
		Heredity (the adjective is hereditary) is the transfer of characteristics from parent to offspring, either through their genes or through the social institution called inheritance (for example, a title of nobility is passed from individual to individual according to relevant customs and/or laws).
		The inheritance of acquired characteristics was shown to have little basis in the 1880s when August Weismann cut the tails off mice to find that their offspring did develop tails.
		The inheritance of acquired characters appealed to the communist leaders, Lysenkoist movement being led by Trofim Lysenko.
	oldion.com /articles/Heredity (638 words)

	Basic Principles of Genetics: Exceptions to Simple Inheritance
		For instance, it is now understood that inheriting one allele can, at times, increase the chance of inheriting another or can affect how and when a trait is expressed in an individual's phenotype.
		Apparent blending can occur in the phenotype when there is incomplete dominance resulting in an intermediate expression of a trait in heterozygous individuals.
		As we learn more about the inheritance patterns for these traits, it is becoming clear that at least some of the twelve exceptions to the simple Mendelian rules of inheritance described here are, in fact, relatively common.
	anthro.palomar.edu /mendel/mendel_3.htm (1411 words)

	Introductory Biology Courseware (103)- Principles of Inheritance (Site not responding. Last check: 2007-10-26)
		At the time of his work, the role of chromosomes in inheritance was not known; mitosis and meiosis had not been discovered.
		Although at first one might conclude from a cross of red and white snapdragons that blending of parental characteristics is the cause, further studies would cause a rejection of this notion.
		If blending were the cause of pink flower color, one would predict that white crossed with pink would produce lighter pink, but such is not the case (what do you predict the actual results would be?).
	tidepool.st.usm.edu /crswr/103inheritance.html (1926 words)

	QEC GB Genetics Frame (Site not responding. Last check: 2007-10-26)
		Predict the results of a cross between two individuals with one or two specified traits given the genetic basis of the inheritance for each trait.
		Blending inheritance always results in intermediates and eventually variation disappears.
		Based on plant breeding experiments and mathematics, Mendel proposed that inheritance was mediated by genetic units that were preserved from generation to generation.
	www.qeced.net /bio/genbio/genetics.htm (703 words)

	Bio 120 Home Page
		In blending inheritance, if there are no efffects of environment on a trait, the value of a trait in an offspring is
		The term "Blending" arises because one view of the mechanism of this mode of inheritance was that gametes
		Under blending inheritance, the amount of genetic variation is reduced by 1/2 each generation by random mating.
	www.biology.duke.edu /rausher/lec3_05.html (804 words)

	Human Genetics - Multifactorial Inheritance
		Multifactorial inheritance was first studied by Galton, a close relative of Darwin and a contemporary of Mendel.
		On the other hand, Galton studied the inheritance of continuous characters, height in humans, intelligence in humans, etc. Galton noticed that extremely tall fathers tended to have sons shorter than themselves, and extremely short fathers tended to have sons taller than themselves.
		On the other hand, the inheritance of quantitative traits could not be used to predict outcomes, only average estimates measured in large population studies.
	www.uic.edu /classes/bms/bms655/lesson11.html (2713 words)

	James Connolly: Home Thrusts (1900)
		Yet the ‘Spiritual Inheritance’; orators and writers are all in favour of capitalism, and opposed to Socialism.
		Because their belief in a spiritual inheritance does not weaken their determination to hold firmly on to the incomes derivable from their material inheritance of land and capital, – and the legal title it confers to a share in the plunder of the Irish worker.
		Mr Cogan is a provision dealer, and the beautiful and entirely ingenuous manner in which he promises to combine in his own person a solicitude for the spiritual side of the Irish character, and the interests of the provision trade is worthy of all praise.
	www.marxists.org /archive/connolly/1900/11/homed.htm (886 words)

	Lecture 6: Patterns of Inheritance
		First, a bit of history -- in the mid-1800's the prevailing view was that the hereditary material was a fluid, perhaps blood -- terms still in use that reflect this idea: bloodline, blue blood, etc. -- inheritance was viewed as the mixing of blending of fluids every generation = theory of blending inheritance.
		Mendel noticed that the inheritance of each trait appeared to be independent of (unaffected by) the inheritance of the other trait.
		Sickle-cell disease is caused by an allele at the gene for hemoglobin -- besides effecting the shape of the red blood cell, this defect causes physical weakness, heart failure, impaired mental function, pneumonia, rheumatism and kidney failure.
	www.sci.sdsu.edu /class/bio100/Lectures/Lect06/lect06.html (1592 words)

	Chapter 14: Mendel and the Gene Idea (Site not responding. Last check: 2007-10-26)
		The predominant view of inheritance, previous to Mendel’s work, was that offspring were an intermediate blend of their parents.
		Second, blending inheritance was incompatible with accumulating evidence gathered by evolutionists of the mid to late 1800’s, such as Darwin, Lamark, and Wallace.
		Mendel performed crosses to observe inheritance of traits individually or to observe a pair of traits simultaneously.
	faculty.valencia.cc.fl.us /kmalmos/GeneticsI.htm (2931 words)

	Observable Patterns of Inheritance (Site not responding. Last check: 2007-10-26)
		Blending would produce uniform populations–such populations could not evolve.
		Many observations did not fit blending–for example, a white horse and a fl horse did not produce only gray offspring.
		The Mendelian theory of segregation states that 2 n organisms inherit two genes per trait located on pairs of homologous chromosomes.
	www.guam.net /pub/sshs/depart/science/mancuso/apbiolecture/11_inherit/phenotyp.htm (930 words)

	BBC Evolution Weekend: Darwin - the Man And His Legacy (Site not responding. Last check: 2007-10-26)
		This was the theory that improvements acquired during an organism's lifetime, such as the growth of organs during use and their shrinkage during disuse, were inherited.
		On this blending inheritance theory, not only are offspring intermediate between their two parents in character and appearance, but the hereditary factors that they pass on to their own children are themselves inextricably merged.
		Whether or not offspring are bodily intermediate between their two parents, they inherit, and pass on, discrete hereditary particles – nowadays we call them genes.
	www.bbc.co.uk /education/darwin/leghist/dawkins.htm (2224 words)

	LRB \| Andrew Berry : Data Guy (Site not responding. Last check: 2007-10-26)
		The prevalent view at the time was an intuitively appealing one, 'blending inheritance', whereby Junior's characteristics are about halfway between - or a blend of - those of his parents.
		Under blending inheritance, the same thing happens to genetic variation: everything converges on a nondescript middle ground.
		He was concerned about the consequences of blending inheritance for his theory, but his observation of abundant variation in natural populations was in the end more important to him than understanding its source.
	www.lrb.co.uk /v22/n03/print/berr01_.html (2643 words)

	Meet Brother Gregory (Site not responding. Last check: 2007-10-26)
		In Mendel's time, the prevalent explanation for inheritance was dominated by two ideas; offspring were a "blend" of two "fluids" donated by their parents and that the male parent's donation was more important than the female's donation to the offspring.
		Mendel made an important contribution to genetics when he confronted this issue head on and stressed that in his experiments there was a complete dominance of one form (at least most of the time).
		Mendel insisted from the beginning that the contribution from the "pollen parent" was no more (or no less) important in influencing the form of the hybrid than the contribution by the female parent.
	www.brooklyn.cuny.edu /bc/ahp/MBG/fluids.html (238 words)

	Patterns of Inheritance
		Farmers knew that traits from both males and females can be passed to the offspring, and that traits can disappear in one generation only to reappear in the next.
		Hemophilia - Inherited condition where blood is slow to clot or does not clot at all.
		Sickle-Cell Anemia is a recessive inherited disorder in which afflicted individuals have defective hemoglobin, and thus are unable to properly transport oxygen to tissues.
	www.blinn.edu /brazos/natscience/vs/Raven%20Chapter13.htm (865 words)

	Article in World of Dawkins Web Site (Site not responding. Last check: 2007-10-26)
		The intuitively plausible blending inheritance theory, that variation disappears over generations, of Darwin's time was not just wrong, it was grievously wrong and especially grievous for natural selection.
		The fact that Darwinism could not work under the assumption of blending inheritance was pointed out in a hostile review of the Origin by the Scottish engineer Fleeming Jenkin.
		What Jenkin should have realised is that blending inheritance is incompatible not just with Darwinian theory but with obvious fact.
	www.world-of-dawkins.com /Dawkins/Work/Articles/2003-02-08darwin-wallace.shtml (2761 words)

	Patterns of Inheritance
		The theory of natural selection did not fit with the prevailing view of inheritance: blending.
		Blending would produce uniform populations; such populations could not evolve.
		The Mendelian theory of segregation states that diploid organisms inherit two genes per trait, and each gene segregates from the other during meiosis such that each gamete will receive only one gene per trait.
	www.sonoma.edu /users/c/cannon/110chapter10.html (887 words)

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