You Are Studying Two Linked Genes in Lizards How Can You Explain the Drastic Difference Between These Two

question 36

Multiple Choice

You are studying two linked genes in lizards. You have two females and you know that both are the same genotype, heterozygous for both genes (A/a and B/b) . You testcross each female to a male that is fully homozygous recessive for both genes (a/a and b/b) and get the following progeny with the following phenotypes: $$\begin{array} { l l } \text { Female } 1 & \text { Female } 2 \\A B - 37 & A B - 5 \\a b - 33 & a b - 4 \\A b - 4 & A b - 35 \\a B - 6 & a B - 36\end{array}$$ How can you explain the drastic difference between these two crosses?

• A) The two genes are assorting independently in female 1 and are linked in female 2.
• B) The two genes are linked in female 1 and are assorting independently in female 2.
• C) The two alleles are in the coupling configuration in female 1 but in the repulsion configuration in female 2.
• D) The two alleles are in the repulsion configuration in female 1 but in the coupling configuration in female 2.
• E) The two genes are likely located on a sex chromosome in female 1 and are likely located on an autosome in female 2.

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