What is the probability in% of the appearance of a white rabbit when crossing a white rabbit
What is the probability in% of the appearance of a white rabbit when crossing a white rabbit and a black rabbit (black dominates) in the first and second generation?
Let’s designate the gene that causes the black color of the rabbit fur as C, then the gene that gives the rabbit fur white will be designated as c.
Most likely, the problem implies that the black rabbit is purebred: homozygous for the gene for black fur. Let’s write it down CC. It will produce the same type of germ cells C.
White rabbit – cc. It produces eggs of the same type – C.
In the F1 offspring, all rabbits will be Cc heterozygotes and have black fur. The probability of a white rabbit appearing is 0%.
Heterozygous individuals Cc are capable of producing germ cells of two types – c and C.
When crossing them together, you get the F2 offspring, including the following options:
homozygous rabbits with white fur (cc) – 25%;
heterozygous rabbits with black fur (Cc) – 50%;
homozygous rabbits with black fur (CC) – 25%.
Answer: in F1 – 0%, in F2 – 25%.