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Biology 1001A Lecture Notes - Lecture 9: Quantitative Trait Locus, Scientific Modelling, Y Chromosome

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amaranthworm558
22 Oct 2016
School
Western University
Department
Biology
Course
Biology 1001A
Professor
Tom Haffie

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Document Summary

Cycle 5: inheritance of variation october 20, 2015. Mutations happen for no reason other then for inheritance. Origin of variation is not directed cells do not know which mutations are best for them. The combination of many genes can give rise to many combinations if it is polygenic inheritance. Mendel was able to realize that particulateness of inheritance that there are specific genes and alleles he was able to do this by looking at traits that were simple (not. Quantitaive analysis allowed him to come up with the scientific model that each trait is coded by genes one of which that is dominant. A small part of the y chromosome that is homologous with x. Genes for making uterus are all over the place (including autosomes) Mendel worked with genes that did not effect each other. Epistasis works for genes that do affect each. Most genes are polygenic anyways so most of the time genes do affect each other.

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Related Questions

The inheritance rule was initially discovered by Mendel and it depends on clear or qualitative traits. The theory was based on a single gene that was responsible for one character. However, expression of many traits are not governed by a single gene, rather can involve multiple genes as well as additive effects. This kind of inheritance pattern is known as quantitative and is demonstrated by East (1916) as well as others. He performed experiments using 2 homozygous, pure-breeding lines of Nicotiana longiflora that differed in corolla length. After crossing these lines, F1 offspring had an intermediate length for corolla and had same variation level as in parents. But found a very different result for F2 and F3 than expected. Discuss the reasons for this result and if it agrees/disagrees with Mendel’s law. Using obtained knowledge so far, what kind of cumulative effects would you add to this variation?

The inheritance rule was initially discovered by Mendel and it depends on clear or qualitative traits. The theory was based on a single gene that was responsible for one character. However, expression of many traits are not governed by a single gene, rather can involve multiple genes as well as additive effects. This kind of inheritance pattern is known as quantitative and is demonstrated by East (1916) as well as others. He performed experiments using 2 homozygous, pure-breeding lines of Nicotiana longiflora that differed in corolla length. After crossing these lines, F1 offspring had an intermediate length for corolla and had same variation level as in parents. But found a very different result for F2 and F3 than expected. Discuss the reasons for this result and if it agrees/disagrees with Mendel’s law. Using obtained knowledge so far, what kind of cumulative effects would you add to this variation?

The inheritance rule was initially discovered by Mendel and it depends on clear or qualitative traits. The theory was based on a single gene that was responsible for one character. However, expression of many traits are not governed by a single gene, rather can involve multiple genes as well as additive effects. This kind of inheritance pattern is known as quantitative and is demonstrated by East (1916) as well as others. He performed experiments using 2 homozygous, pure-breeding lines of Nicotiana longiflora that differed in corolla length. After crossing these lines, F1 offspring had an intermediate length for corolla and had same variation level as in parents. But found a very different result for F2 and F3 than expected. Discuss the reasons for this result and if it agrees/disagrees with Mendel’s law. Using obtained knowledge so far, what kind of cumulative effects would you add to this variation?