Which of the Following Crosses Would Produce a 1:1 Ratio

Question

Which of the following crosses would produce a 1:1 ratio of phenotypes in the next generation?
A)AA × AA
B)AA × aa
C)Aa × Aa
D)Aa × aa
E)aa × aa

Accepted Answer

A cross between Aa (heterozygous) and aa (homozygous recessive) will produce offspring with a 1:1 ratio of Aa (heterozygous) to aa (homozygous recessive) phenotypes.