Multiple Choice
Which of the following is not considered a sex-linked trait?
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13. Mendelian Genetics
Sex-Linked Inheritance
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What is the genotype of a woman with red-green color blindness?
A
X^CY
B
X^cY
C
X^CX^c
D
X^cX^c
Verified step by step guidance1
Understand that red-green color blindness is a sex-linked recessive trait, which means it is carried on the X chromosome and requires two copies of the recessive allele to be expressed in females.
Recognize that females have two X chromosomes (XX), so for a woman to express red-green color blindness, she must have two copies of the recessive allele (X^c).
Identify the possible genotypes for a woman: X^CX^C (normal vision), X^CX^c (carrier, but normal vision), and X^cX^c (color blind).
Since the woman is color blind, she must have the genotype X^cX^c, as this is the only genotype that results in the expression of the recessive trait in females.
Conclude that the genotype of a woman with red-green color blindness is X^cX^c, as both X chromosomes carry the recessive allele for color blindness.
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