Which of the following is true about color blindness

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All of the following are true of color blindness, EXCEPT it can be passed from a color-blind mother to her son. it only rarel

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Ans it only occurs in females is a wrong statement .

Colorblindness is a sex (X)linked recessive trait . Means the
defective gene will be on X chromosome .

So in females they carry two X chromosomes while males have XY
chromosomes . Females inherit one X chr from father and one from
mother . While males inherit X chr from mother and Y chr from

For a female to be colorblind both the X chromosomes need to
carry the defective allele. So if X* is the defective chromome.
Then for a female to be colorblind the genotype has to be X*X* .
Becuase if it is X*X since the condition is recessive the normal X
chr dominates and supresses the effects of the defective Chromome.
So the female becomes a carrier. That is she inherited the disorder
but is not colirblind . For a female to be coloirblind ,she must
inherit one defective X* chr from father and one X* from mother

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But in males only one X chr is present and since the disorder is
X linked ,the condition gets expressed .

So males are more commonly affected . But females can also be
affected ,but the probability is lesser than males .

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