Question

If a female that is a carrier for colorblindness has a child with the male that has normal vision what percentage of the children may be colorblind

A. 0%
B. 25%
C. 50%
D. 75%

Answer 1

C. 50% If a male with normal vision and a female with the colorblind gene reproduce all of their kids have a 50% chance of being colorblind.

Answer 2

Ans ) B)25%

Explanation : Female is carrier of colorblindness and the male with whom se bears a child is normal .

Now, we know colourblindness is a 'x' linked disease.

Female will produce two gametes one for normal 'x' and other 'x' which is carrier for recessive trait.

And male will produce one 'x' and one 'y' gamete.

Here 50% individual will be female who may or may not be carrier but can never be affected or colorblind

And among male individuals who are formed because male parent will share its 'y' chromosome has 50% chance of being colorblind. So chance of getting affected progeny is 50% of 50% i.e. 25%.

Hope it helps!!!