In a cross of parents with AA and aa genotypes for a particular trait,F₁ offspring would show which genotype(s)?

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Quizplus · Accepted Answer

F₁ can be interpreted as F1 generation of a dihybrid cross between AA and aa parents. The two letters in each pair represent alleles of different genes that control different traits on different chromosomes. The numbers and symbols indicate that each parent has homozygous dominant (AA) or homozygous recessive (aa) genotypes, respectively, for both genes. By crossing these purebred parents, all the F1 offspring will be heterozygous (Aa) for both traits, because each gamete from the AA parent will have an A allele for one gene and an A allele for the other gene, while each gamete from the aa parent will have a a allele for one gene and a a allele for the other gene. Therefore, the genotype that all F1 offspring will share is Aa only.

In a Cross of Parents with AA and Aa Genotypes