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.

Question

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.

Quizplus · Accepted Answer

The results indicate that the two genes are not assorting independently, meaning that they are physically linked on the same chromosome. This suggests that one of the parents has a translocation between chromosomes 3 and 7, causing the non-random segregation of the genes in the progeny.

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

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