If a single crossover occurs during mitosis in heterozygotes, then
A) loci distal to the crossover on the same chromosome arm may become homozygous.
B) recessive phenotypes can be expressed.
C) phenotypic changes are not observed.
D) only wild-type phenotypes are observed.
E) Both A and B

Question

Quizplus · Accepted Answer

A single crossover during mitosis in heterozygotes can lead to homozygosity for loci distal to the crossover, allowing recessive phenotypes to be expressed.

If a Single Crossover Occurs During Mitosis in Heterozygotes, Then