Question

A gene that has two alleles, A and a, is located on the same chromosome as a second gene that also has two alleles, B and b. Suppose a diploid individual has alleles AB on one copy of this chromosome and alleles ab on the other copy of this chromosome. For this individual, select the pair of recombinant genotypes that could result if crossing over occurs between these two chromosomes.1. AB and aB

2. Ab and ab
3. Ab and aB
4. AB and ab

Answer 1

Option C or 3, i.e Ab and aB is correct

Step-by-step explanation:

First copy of allele is AB

Second copy of allele is ab

The allele pair AB will segregate into genes A and B

The allele pair ab will segregate into genes a and b

The recombinant genotype will consist of one gene from each allele pair

Thus, if first allele pair give A gene the second allele pair will given b gene, so the genotype would be Ab

Likewise, if if first allele pair give B gene the second allele pair will given a gene, so the genotype would be aB

Option C or 3, i.e Ab and aB is correct