In Yeast,the Gene Phe1 Is on Chromosome 3 and Lys4 $\begin{array}{ll}47 \% & +;+ \\44 \% & \text { phel; lys4 } \\4 \% & \text { phel; }+ \\5 \% & +; \text { lys } 4\end{array}$

question 18

Multiple Choice

In yeast,the gene phe1 is on chromosome 3 and lys4 is on chromosome 7.The progeny (spores) from the cross +;+ × phe1;lys4 were:
$\begin{array}{ll}47 \% & +;+ \\44 \% & \text { phel; lys4 } \\4 \% & \text { phel; }+ \\5 \% & +; \text { lys } 4\end{array}$


This results suggests that:

• A)a nondisjunction occurred.
• B)one parent has a deletion.
• C)one parent has an inversion.
• D)one parent has a translocation.
• E)unequal crossovers occurred.

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Definitions:

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The process of shedding the uterine lining, resulting in bleeding through the vagina, which typically occurs as part of the monthly menstrual cycle in human females.