Question

In sesame, the one-pod condition (P) is dominant to three-pod (p), and normal leaf (W) is dominant to wrinkled (w). These characteristics assort independently. A one-pod, wrinkled leaf × one-pod, normal leaf cross gave a progeny of 654 one-pod, normal leaf plants and 224 three-pod, normal leaf plants. What are the likely genotypes of the parents in this cross?

a) PpWw × PpWw
b) PpWw × Ppww
c) PPww × PpWw
d) PPWW × Ppww

Answer 1

The likely genotypes of the parents in this cross are PpWw x PpWw (answer choice a).

Step-by-step explanation:

To determine the likely genotypes of the parents, we need to analyze the progeny of the cross. We have 654 one-pod, normal leaf plants and 224 three-pod, normal leaf plants. Based on these numbers, we can deduce that the parents must both be heterozygous for the one-pod trait, since the only way to get three-pod plants is if both parents contribute the recessive allele. Furthermore, we can determine that the parents must be heterozygous for the normal leaf trait as well, since all of the progeny have normal leaves. Therefore, the likely genotypes of the parents in this cross are PpWw x PpWw (answer choice a).