Question

The gene for black fur (B) is dominant over the gene for white fur (b) in mice. A homozygous dominant female and a heterozygous male produce 200 offspring during their lifetime. Approximately how many offspring would be expected to be homozygous dominant?
A
25
B
50
C
100
D
200

Answer 1

Homozygous would be BB and heterozygous would be Bb.

Knowing this we can put the info into a punnet square (pic is attached of mine)

As a result we see only half of them would be homozygous dominant, and half of 200 is 100.

So, the answer is C. 100

I hope that helps u!!

Answer 2

Approximately 100 offspring would be expected to be homo-zygous dominant (Option D).

• An allele is a gene variant, in a diploid organism, two alleles are inherited (one from the mother and another from the father).

• A recessive allele is a gene variant completely masked by a dominant allele in heterozygous individuals.

• In this case, it is possible to estimate the genotype frequencies by using the Punnett square.

In conclusion, approximately 100 offspring would be expected to be homo-zygous dominant (Option D).

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