Principle-Of-Inheritance-And-Variation Question 617
Question: A colour blind man marries the daughter of a colour blind person. Then in their progeny [AIIMS 1983, 92; CBSE PMT 1988; MP PMT 1994]
Options:
A) None of their daughters are colour blind
B) All the sons are colour blind
C) All the daughters are colour blind
D) Half of their sons are colour blind
Show Answer
Answer:
Correct Answer: D
Solution:
Since daughter of a colourblind person will be a carrier of the disease and only one of the two X chromosomes will bear the recessive gene for disease, so half of their sons will be colourblind.
BETA
