In sesame plants, the one-pod condition(P) is dominant to the3-pod condition (p)

Question

In sesame plants, the one-pod condition(P) is dominant to the3-pod condition (p), and normal leaf(L) is dominant to wrinkledlead (l). Pod type and leaf type are inherited independently.Determine the genotypes for the two parents for all possiblematings producing the following offspring: 150 one-pod, normal leaf, 147 one-pod, wrinkled leaf, 51three-pod, normal leaf, and 48 three-pod, wrinkled leaf. Please explain your answer In sesame plants, the one-pod condition(P) is dominant to the3-pod condition (p), and normal leaf(L) is dominant to wrinkledlead (l). Pod type and leaf type are inherited independently.Determine the genotypes for the two parents for all possiblematings producing the following offspring: 150 one-pod, normal leaf, 147 one-pod, wrinkled leaf, 51three-pod, normal leaf, and 48 three-pod, wrinkled leaf. Please explain your answer

Explanation / Answer

Assuming that the two genes assort independently, you can treatoffspring frequencies separately for the two genes and work fromthere. n=total number of offspring=396 1-pod (P) vs. 3-pod (p) (150+147)/396=3/4 (for 1-pod) (51+48)/396=1/4 (for 3-pod) This is a 3:1 phenotypic ratio, which is consistent with a crossbetween two heterozygotes. So both parents are Pp and Pp forthe pod gene. (if you want, you can do a Punett square toverify the offspring ratios for Pp x Pp. You should get 1/4PP, 2/4 Pp, and 1/4 pp, which is a 3:1 phenotypic ratio). normal leaf (L) vs. wrinkled leaf (l) (150+51)/396=0.50 (for normal leaf) (147+48)/396=0.50 (for wrinkled leaf) This is a 1:1 phenotypic ratio, which is consistent with a crossbetween a heterozygote and a homozygotic recessive. So bothparents are Ll and ll for the leaf gene. (Once again, if youdo a Punett square for Ll x ll. You should get 2/4 Ll and 2/4ll, which is a 1:1 phenotypic ratio). So the parents of the cross are PpLl and Ppll. (if you do aPunett square for this, you'll get a 3:3:1:1 phenotypic ratio,which are consistent with your results). I hope this helps.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.