Solve this:
Q.123. A holandric gene is known for hypertrichosis (long hairs on ears). When a man with hairy ears marries a normal woman, what percentage of their sons would be expected to have hairy ears :-
(1) 100 %
(2) 0 %
(3) 50 %
(4) 25 %

Dear Student, 

Genes located on Y – chromosome are known as holandric genes. Traits linked with holandric genes are called as Y-linkage or holandric inheritance.

Hypertrichosis (long hairs on ears) is Y-linked or holandric trait .
 
Genotype of man with hairy ear = XY^H
Genotype of normal woman = XX
 
When,  a man with hairy ears marries a normal woman,

 

Thus , all the sons will be affected . Option (1) is the correct answer.


Regards,