Question

In rabbits, black fur is dominant to white fur.
A) if you cross a BB male with a Bb female, what are the possible genotypes and phenotypes of the offspring? What is percentage chance of each type?

Answer 1

Crossing a BB male with a Bb female:

The Punnett Square will look like this:

BB BB

Bb Bb

The percentage will be as follows:

- You will have 50% homozygous dominant (BB)

- You will have 50% heterozygous (Bb)

Now, for the phenotype, you will have 100% black fur, since B is dominant and is prevalent in 100% of all the breeds.

For the genotype, you have 50% BB and 50% Bb

Answer 2

If you cross a  BB male with a Bb female, you will obtain a 50% BB genotype and a 50% Bb genotype as well as a 100% black phenotype.

The genotype is the sum total of the genes that an organism inherits from its parents. These genes occur in pairs called alleles. In each allele, one gene is dominant and the other gene is recessive.

If a cross is performed and the dominant gene is present, it is always expressed. The recessive gene is only expressed when a pair of alleles are composed of two recessive genes. In this case, the black fur is dominant to white fur. The black fur is shown as B while the white fur is shown as b.

Performing a cross of the BB male and Bb female, we can see that we will obtain a 50% BB genotype and a 50% Bb genotype as well as a 100% black phenotype.

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