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If colorblindness was a dominant trait, which of the following would not be true?

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If colorblindness was a dominant trait, which of the following would not be true?

(a) It would be expressed in heterozygous females

(b) It would be expressed in males

(c) It would never be turned off

(d) It would not skip generations

I got this question by my college director while I was bunking the class.

My question is taken from Sex Linked Inheritance in chapter Chromosomes and Sex Determination of Cytogenetics

1 Answer

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Right option is (c) It would never be turned off

To explain: Due to dosage compensation X chromosomes are randomly turned off, so the mutant X could as well be turned off in heterozygote. Also it will affect every generation as it would be dominant. Option a and b are also true.

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