Can you help me with this question?

Question

A parent has one dominant allele for black fur and one recessive allele for white fur. The other parent has two recessive alleles for white fur. In this cross what is the chance that the offspring will have white fur? What is the chance they will have black fur? What is the chance that they will have the recessive genotype?

Answer 1

50% of Parent A 's gametes have the allele for Black fur (B) and 50% for white. All of Parent B's alleles are for white fur (w).

Therefore, 50% of the offspring will be heterozygotes (Bw) and 50% will be homozygotes (ww).

So it's half and half. You would expect 50% of each phenotype (one of which is recessive).

This is called a testcross, by the way.

Answer 2

Chances of being white: 50% (1/2)
" " " black: 50% (1/2)
" " having a recessive allele: 100 %

According to a punnet square these would be the results

Bb bb
Bb bb

Answer 3

Using a Punet Sqare the odds work out to be 50%/50%.