Question

What is the genotype of the F₁ generation when crossing AABBCC (darkest skin) with aabbcc (lightest skin)?

Options

• AAbbCC

• AABBCC

• AaBbCc

• aabbcc

Answer 1

When crossing a homozygous dominant parent (AABBCC) with a homozygous recessive parent (aabbcc), all F₁ offspring receive one allele from each parent at every locus. The resulting F₁ genotype is AaBbCc, which produces an intermediate phenotype between the two parental extremes, demonstrating the additive nature of polygenic inheritance.