AP BIOLOGY

HEREDITY

INCOMPLETE DOMINANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In humans, albinism is a recessive trait. What is the probability that two heterozygous parents (Aa) will have an albino child?
A
0%
B
25%
C
50%
D
75%
E
100%
Explanation: 

Detailed explanation-1: -For two heterozygote parents (Aa), 1/4 of all offspring would be expected to show the recessive trait of albinism.

Detailed explanation-2: -Autosomal recessive inheritance This means a child has to get 2 copies of the gene that causes albinism (1 from each parent) to have the condition. If both parents carry the gene, there’s a 1 in 4 chance that their child will have albinism and a 1 in 2 chance that their child will be a carrier.

Detailed explanation-3: -The genotype of albinos is aa while, the genotype of other members of population are either AA or Aa.

Detailed explanation-4: -The correct option is A 25% Albinism is an autosomal recessive disease.

Detailed explanation-5: -Albinism is an autosomal recessive disorder . The parents of the child suffering from this disease will carry one copy of the mutated gene . So there will be 50 % chances for this disease to occur in their second child .

There is 1 question to complete.