AP BIOLOGY

THE HUMAN IMMUNE SYSTEM

BLOOD GROUPS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Brown (B) is dominant over white (b). Which is a homozygous GENOTYPE of BROWN FUR?
A
BB
B
Bb
C
bb
D
B
Explanation: 

Detailed explanation-1: -Brown is recessive, which means brown individuals must have the genotype bb.

Detailed explanation-2: -An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype. In our example, this genotype is written Bb.

Detailed explanation-3: -Genotypes with two alleles that are the same, i.e. ‘BB’ and ‘bb’, are known as homozygous genotypes and genotypes with two different alleles are known as heterozygous genotypes.

Detailed explanation-4: -Brown fur is dominant to white fur in a species of rabbit and is represented with the alleles “B” and “b". What are the resulting percentages of genotypes of a cross between a homozygous dominant parent and a heterozygous parent? Explanation: The answer is 50% BB and 50% Bb, as shown in the punnet square below.

There is 1 question to complete.