A plant trisomic for a chromosome carrying the A gene has the genotype A/a/a.Which of the following represents a gamete this plant could NOT produce?
A)A/a
B)A
C)a
D)A/A

Question

Quizplus · Accepted Answer

The plant is trisomic for the chromosome carrying the A gene, which means it has three copies of the chromosome. Therefore, it can produce gametes with any combination of A or a alleles, including A/A (since one of the three chromosomes may carry the A allele). Therefore, the gamete it could NOT produce is D (A/A).

A Plant Trisomic for a Chromosome Carrying the a Gene