1. Linkage violates Mendel’s second rule (independent assortment). Lets consider
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Question
1. Linkage violates Mendel’s second rule (independent assortment). Lets consider why Mendel did not detect linkage in his own work.
a. One possibility is that all of the “factors” (genes) that Mendel analyzed were on different chromosomes in peas (this is plausible because Mendel analyzed seven different traits, and by coincidence, there are seven pairs of chromosomes in peas). Briefly explain why this would have prevented Mendel from detecting linkage in his data.
b. As it turns out, this is not the case, and some of Mendel’s genes are, in fact, found on the same chromosome. How is it possible that Mendel did not detect the effects of linkage even though some of his genes were on the same chromosome? [Hint: It is not because he failed to perform any of the relevant crosses or because he simply failed to notice the pattern in his data.]
Explanation / Answer
A) Mendel studied seven characters which are located on four different chromosomes and during meiosis in metaphase I homologus chromosome move to different opposite poles so we cannot see linkage when the two genes are located on two different chromosomes
B) even though some of the genes are located on same chromosomes they are located very apart from each other at a distance of more than 0.5cM and recombination can easily take place between those Gene so we cannot see linkage they assoet independently as like they are located on different chromosomes.
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