The offspring of a monohybrid testcross would have what possible genotype(s)?
A) AA and Aa
B) Aa and aa
C) AA, Aa, and aa
D) AA only
E) aa only

Question

Quizplus · Accepted Answer

In a monohybrid testcross, an individual with a dominant phenotype but unknown genotype is crossed with a homozygous recessive individual. The offspring would have either the dominant allele or the recessive allele. Therefore, the possible genotypes for the offspring are Aa (dominant phenotype) and aa (recessive phenotype). The genotype AA is not possible because the individual with the dominant phenotype could be heterozygous (Aa). Hence, the best choice is option B, Aa and aa.

The Offspring of a Monohybrid Testcross Would Have What Possible