Question

If a genetic disease is transferred from a phenotypically normal but carrier
female to only some of the male progeny, the disease is:
a. Autosomal dominant
b. Autosomal recessive
c. Sex-linked dominant
d. Sex-linked recessive


NCERT Class XII
Biology - Main Course Book

Chapter 5. Principle of Inheritance and Variation

Answer 1

d. Sex- linked recessive is the correct option.

Answer 2

Answer:

D. Sex-linked recessive

Explanation:

Sex linked recessive disease are those which will express only when the chromosome for which they are recessive, goes to the individual in recessive rather than dominant form.

Lets take example of the Hemophilia A

It is X-linked recessive disease in which the blood do no coagulate due to lack of factor 8. this is due to the mutation in genes of the X chromosome called F8.