The Scandinavian woodpecker(information made up) has two different possible feat

Question

The Scandinavian woodpecker(information made up) has two different possible feather colors. They can either have blue striped feathers (B), or white feathers (b). The blue striped feather allele is dominant. Moreover, they can either have a sharp beak (S) or corkscrew beak (s). The sharp beak is dominant.
Now, Assume two parents that are heterozygous for both traits are crossed (BbSs X BbSs).
2. What portion of blue-striped, sharp beak offspring will be homozygous for both genes? NOTICE: you aren’t working with the entir possible offspring pool here.

**The above photo is my answer of 1/16...but in the teachers answer key the answer is suppose to be 1/9. Can someone please explain how she got this answer? Thank you** What proportion ofblue striped sharp beak offs pring will be homozygous for oth genes? NOTICE: you aren't working with the entire possible ofispring pool here on lu

Explanation / Answer

Cross: BbSs x BbSs

Gametes: BS, Bs, bS, bs (from both parents)

punnet square-

Answer : The question is what portion of "blue-striped, sharp beak" offspring will be homozygous. so first takeout the blue-striped, sharp beak. (mentioned in bold in the punnet)

Now there are 9 offspring, and only 1 is homozygous for both genes so the answer is 1/9

BS Bs bS bs BS BBSS BBSs BbSS BbSs Bs BBSs BBss BbSs Bbss bS BbSS BbSs bbSS bbSs bs BbSs Bbss bbSs bbss

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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