Question

The Punnett square above shows a cross between two plants. Both plants were heterozygous for dark green leaves (G) and carry the recessive trait for light green leaves (g). In this cross, 50% of the offspring will be —

Responses

heterozygous and have dark green leaves
heterozygous and have dark green leaves

homozygous and have light green leaves
homozygous and have light green leaves

homozygous and have dark green leaves
homozygous and have dark green leaves

heterozygous and have light green leaves
heterozygous and have light green leaves

Answer 1

heterozygous and have dark green leaves

Explanation: Gg × Gg gives genotypes 1 GG : 2 Gg : 1 gg, so 2/4 = 50% are heterozygous (Gg) and express the dominant dark-green trait.