In dogs, a Brown coat (B) is dominant to a blonde coat. A dog owner has a Brown-coated dog, but is not sure of the dogs genotype. The owner should breed his dog with which of the following in order to determine his dogs genotype?

MONOHYBRID CROSS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

In dogs, a Brown coat (B) is dominant to a blonde coat. A dog owner has a Brown-coated dog, but is not sure of the dog’s genotype. The owner should breed his dog with which of the following in order to determine his dog’s genotype?

A	Brown coated dog (BB)
B	Brown coated dog (Bb)
C	Blonde coated dog (bb)
D	A dog with a heterozygous genotype

Explanation:

Detailed explanation-1: -In the case of Labradors, the black and chocolate colors are determined by dominant and recessive alleles at one gene locus. The black coat color (B) is dominant to chocolate (b). Therefore, a puppy will only be chocolate if each parent contributes a chocolate allele (b) giving the puppy a genotype of “bb”.

Detailed explanation-2: -For example: Black is the colour commonly seen in dogs. This shows that black is the dominant gene in dogs, represented by BB. The genotypes like BB and Bb represents dominant black.

Detailed explanation-3: -This indicates that every puppy must have inherited a dominant allele from the brown parent. The most likely genotype of the brown parent would be homozygous dominant, which would lead to all puppies being heterozygous and brown. All offspring will be Bb and express the dominant brown phenotype.

Detailed explanation-4: -A. the gene for brown hair is carried on the maternally derived chromosome. B. brown hair is a dominant trait.

There is 1 question to complete.

AP BIOLOGY

HEREDITY

MONOHYBRID CROSS