PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A man, who has red-green colorblindness, and his wife, who is a carrier for colorblindness, have a colorblind son. What is the probability that their next son will also be colorblind?
A
0%
B
25%
C
50%
D
100%
Explanation: 

Detailed explanation-1: -Therefore there will be a 50% chance of the sons being colour blind and 50% chance of the sons being normal.

Detailed explanation-2: -What is the probability that a woman who is a carrier for the red-green color-blindness allele and a man who is color blind will have a child who is NOT color blind? 50%.

Detailed explanation-3: -When a colour blind woman marries a normal visioned male, daughters will be carrier for this disease and all sons will be colour blind, this can be represented as follows: So, the correct answer is ‘All sons are colour blind, daughters carriers’.

Detailed explanation-4: -Since mother is colourblind, son is also colourblind). 100% progeny will be colour blind.

Detailed explanation-5: -If a couple has a child and the father has normal vision and the mother is a carrier for colorblindness, the male children will have a 50% probability of having colorblindess, and the female children will all have normal color vision unaffected by colorblindness.

There is 1 question to complete.