(D) $1$. The parents are phenotypically normal,but they have affected children. This indicates that the disease is recessive.$2$. The disease affects

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(D) $1$. The parents are phenotypically normal,but they have affected children. This indicates that the disease is recessive.$2$. The disease affects only the sons ($3$ out of $5$) and none of the daughters are affected.$3$. In $X$-linked recessive inheritance,a carrier mother $(X^CX)$ can pass the trait to her sons $(X^CY)$,while the father is unaffected $(XY)$.$4$. Since the trait appears in males and skips generations (parents are unaffected),it is characteristic of $X$-linked recessive inheritance.

Class 12 Biology Principles of Inheritance and Variation Pedigree Analysis and Mendelian disorders

Medium

$A$ man and a woman,who do not show any apparent signs of a certain inherited disease,have seven children ($2$ daughters and $5$ sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following modes of inheritance do you suggest for this disease?

AIPMT 2005 All AIPMT

A
Autosomal dominant
B
Sex-linked dominant
C
Sex-limited recessive
D
Sex-linked recessive

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Class 12

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Principles of Inheritance and Variation

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Pedigree Analysis and Mendelian disorders

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If a colorblind man marries a woman with normal vision,what is the probability of their son being colorblind?

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