Question

a plant can have green (G) or yellow (g) leaves. It can also have a long (K) or short (k) stem. A scientist is preparing a Punnett Square for a dihybrid cross of a plant with genotype GGkk. What possible gametes can the plant produce?

Answer 1

The scientist is only crossing GGkk with another GGkk...so the only type of plant the scientist can get back is GGkk! (So, green short stem plants).
No need for a Punnett Square!

Answer 2

The plant will form all the gametes with alleles Gk.

Step-by-step explanation:

The genotype of the given plant is GGkk. Since the plant is homozygous for both the genes, it will form all same type of gametes. Gametes have only one allele for each gene. The plant with genotype GGkk will form the gametes with one copy of "G" and one copy of "k" alleles. Hence, all the gametes formed by the plant with gentoype GGkk will have genotype "Gk".