purple petal color in pea plants is dominant to white petal color. two heterozygous pea plants are crossed…

Explanation:

Step1: Set up the Punnett - square

Let (D) represent the dominant allele for purple petals and (d) represent the recessive allele for white petals. The parents are heterozygous ((Dd)). The possible gametes from each parent are (D) and (d).

Step2: Fill in the Punnett - square

When we set up the (2\times2) Punnett - square, the top row represents the gametes of one parent ((D) and (d)) and the left - hand column represents the gametes of the other parent ((D) and (d)).

	(D)	(d)
(D)	(DD)	(Dd)
(d)	(Dd)	(dd)
The genotypes of the offspring are (DD:Dd:dd = 1:2:1).

Answer:

1. (DD)
2. (Dd)
3. (Dd)
4. (dd)