A - I, II, III, IV, and V only
Explanation:
I. AA x Aa would produce offspring with genotypes AA, Aa, and Aa, resulting in a 1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes (dominant:dominant, dominant:recessive, and recessive:recessive).
II. Aa x aa would produce offspring with genotypes Aa and aa, resulting in a 1:1 ratio of genotypes and a 1:1 ratio of phenotypes (dominant:recessive).
III. Heterozygous x Heterozygous would also produce offspring with genotypes AA, Aa, and aa, resulting in a 1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes.
IV. Aa x Aa would produce offspring with genotypes AA, Aa, and aa, resulting in a 1:2:1 ratio of genotypes and a 3:1 ratio of phenotypes.
V. Homozygous dominant x Heterozygous would produce offspring with genotypes Aa and Aa, resulting in a 1:1 ratio of genotypes and a 1:1 ratio of phenotypes.
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 only
B III and IV only
C I and V only
D II only
1 answer
1 answer