Question

Mr jones is suffering from colour blindness and sickle cell disease.His father is heterozygous for cystic fibrosis.The probability of Mr jones sperm having both the disease alleles is
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Answer 1

Explanation:

Mr. Stevan is suffering from X-linked recessive disorder hemophilia and autosomal recessive disorder cystic fibrosis. The probability of Stevan's sperm having X or Y chromosome is 1/2. Hence, the probability of sperm containing x-linked defective allele is 1/2. Each sperm contains the defective gene for autosomal disorder cystic fibrosis. Hence, the probability of having defective autosomal alleles is 1.

Hence, the probability of Stevan's sperm having recessive X-linked as well as autosomal alleles is 1/2 x 1 = 1/2.

Thus, the correct answer is '1/2.'