Question

In dogs black coat colour is dominant over white.What coloured dog will you choose to breed a given black dog in order to find its genotype? What is this type of cross known as?

Answer 1

And this is known as the Test cross

Answer 2

White color dog will be breed with the given black dog to find its genotype and this cross is called a test cross.

Explanation:

A test cross is the cross that is done to check the genotype of a parent. In test cross, the unknown genotype parent is crossed with homozygous recessive individuals to find out the genotype of other parent.

So if the genotype of the black color coat dog is Bb then it will produce half white and half black color coat offspring.

                              B    b

                        b   Bb  bb

                        b   Bb  bb

If the genotype of the black dog is BB then it will produce all black offspring

                              B     B

                         b   Bb   Bb

                         b   Bb   Bb

Therefore white color dog will be crossed with black dog to find its genotype.

Learn more about test cross:

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