Question

Color-blindness results from both the expression of a single recessive sex-linked allele (b.)

Which of the following is a genotype of a colorblind male?



XbY

XBXB

XBY

XbXb

Answer 1

Answer:

XbY

Explanation:

because the question asks genotype of a male, the chromosomes would be XY, so XBX and XbXb can be eliminated leaving only XBY and XbY. XBY is incorrect because the question states that colorblindness is represented by lowercase b, so the correct answer is XbY.