Question

What is the probability that two parents, who are both carriers of an autosomal recessive disease, will have four children who are all affected by the disease?

A) 25%

B) 1.56

C) 0,39

D) 0

Answer 1

The correct option is A) 25%.

The genotype of carrier father - Cc.

The genotype of carrier mother - Cc.

Parent generation: Cc X Cc.

Gametes C and c C and c.

Next generation:

Male/Female	C	c
C	CC (normal)	Cc (carrier)
c	Cc (carrier)	cc (abnormal or affected)

Probability:

75% autosomal recessive does not express and not affected by the disease.

25% affected by this disease.

Autosomal recessive is a trait, disorder, or disease, which can be passed down through families. One gene in each pair comes from the mother, and the other gene comes from the father and both genes in a pair must be abnormal to cause disease.