Question

In the 1860s Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid crosses involve the study of the inheritance patterns related to two different traits. In guinea pigs the allele for black fur (B) is dominant over the allele for brown fur (b), and the allele for short fur (F) is dominant over the allele for long fur (f). What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits

Answer 1

25%

Step-by-step explanation:

Because i took the test

Answer 2

25% of the progeny is expected to be dihybrid, BbFf, expressing Black and short fur

Step-by-step explanation:

Available data:

• the allele for black fur (B) is dominant over the allele for brown fur (b)
• the allele for short fur (F) is dominant over the allele for long fur (f)
• Cross: BbFf x bbff

Parentals) BbFf x bbff

Phenotypes) Black/Short Brown/Long

Gametes) BF, Bf, bF, bf bf, bf, bf, bf

Punnett square) BF Bf bF bf

bf BbFf Bbff bbFf bbff

bf BbFf Bbff bbFf bbff

bf BbFf Bbff bbFf bbff

bf BbFf Bbff bbFf bbff

F1) 4/16 = 1/4 = 25% of the progeny is expected to be dihybrid, BbFf, expressing Black and short fur

4/16 = 1/4 = 25% of the progeny is expected to be bbFf, expressing Brown and short fur

4/16 = 1/4 = 25% of the progeny is expected to be Bbff, expressing Black and long fur

4/16 = 1/4 = 25% of the progeny is expected to be bbff, expressing Brown and Long fur