Given three possible phenotypes for parents showing dominance (AA, Aa, aa), which combination would produce a 1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes?

I. AA x Aa

II. Aa x aa

III. Heterozygous x Heterozygous

IV. Aa x Aa

V. Homozygous dominant x Heterozygous
Responses

A I, II, III, IV, and V onlyI, II, III, IV, and V only

B III and IV onlyIII and IV only

C I and V onlyI and V only

D II onlyII

1 answer

. II only