Question

Mice come in 2 colors black(t) and tan (T). Tan is dominant. 1. Create a punnet...

Mice come in 2 colors black(t) and tan (T). Tan is dominant.

1. Create a punnet square between 2 heterozygotic tan mice.

2.Out of these offspring what percent would be homozygous recessive? Their phenotype would be?

3. If 1 of the mice parent was TT could that result in a recessive? Explain.

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Answer #1

Answer-

allele fot tan = T

Allele for black = t.

Heterozygous means two dissimilar alleles in a gene , so that means one recessive and one dominant allele pair .

So here Heterozygous will be Tt

Parents- Tt x Tt

F1-

  

T t
T TT Tt
t Tt tt

25% = homozygous recessive tt.

3 . If one one of the mouse parents was TT , all the offsprings would be tan and be either TT or Tt , as offsprings receive one allele in a gene from father and one from mother. Since one parent will only have T allele to pass on ,no mice can be black or recessive .

Parents - TT x Tt

F1-

T t
T TT Tt
T TT Tt

All offsprings will be tan and TT / Tt .

If this helps please give it a positive rating thank you!

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