1) The family pedigree illustrated in picture describes congenital cataracts in

Question

1) The family pedigree illustrated in picture describes congenital cataracts in humans, which is a rare phenotype seen in humans. Squares = Males; Circles = females
Further pedigree analysis suggests this condition is not known in the family of No. 1 male of this pedigree.



This diagram indicates congenital cataracts are inherited as a/an ______. Furthermore, the No.2 female must be _____ in order for this pedigree to occur. Person 5 in the second generation marries a man who does not have cataracts. Two of their four children, a boy and a girl, develop cataracts. What is the probability that their next child will be a girl with cataracts?


A. Autosomal dominant; heterozygous;

B. Autosomal recessive; heterozygous; 1/2

C. Sex-linked dominant; homozygous; 3/4

D. Sex-linked recessive; heterozygous; 100%

1) The family pedigree illustrated in picture describes congenital cataracts in humans, which is a rare phenotype seen in humans. Squares = Males; Circles = females Further pedigree analysis suggests this condition is not known in the family of No. 1 male of this pedigree. This diagram indicates congenital cataracts are inherited as a/an ______. Furthermore, the No.2 female must be _____ in order for this pedigree to occur. Person 5 in the second generation marries a man who does not have cataracts. Two of their four children, a boy and a girl, develop cataracts. What is the probability that their next child will be a girl with cataracts? A. Autosomal dominant; heterozygous; ½ B. Autosomal recessive; heterozygous; 1/2 C. Sex-linked dominant; homozygous; 3/4 D. Sex-linked recessive; heterozygous; 100%

Explanation / Answer

This diagram indicates congenital cataracts are inherited as a/an ______. Furthermore, the No.2 female must be _____ in order for this pedigree to occur. Person 5 in the second generation marries a man who does not have cataracts. Two of their four children, a boy and a girl, develop cataracts. What is the probability that their next child will be a girl with cataracts?


A. Autosomal dominant; heterozygous; ¼

B. Autosomal recessive; heterozygous; 1/2-correct answer

C. Sex-linked dominant; homozygous; 3/4

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