Multiple Choice
In sex-linked inheritance, what can we say about the frequency of X-linked recessive traits in males compared to females?
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13. Mendelian Genetics
Sex-Linked Inheritance
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Which of the following genotypes represent color blind individuals?
A
X^cX^c
B
X^cY
C
X^CY
D
X^CX^c
Verified step by step guidance1
Understand that color blindness is a sex-linked trait, specifically linked to the X chromosome. This means that the gene responsible for color blindness is located on the X chromosome.
Recognize that males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). Therefore, males only need one copy of the color blindness allele to express the trait, while females need two copies.
Identify the notation used for the alleles: 'X^c' represents the allele for color blindness, and 'X^C' represents the normal vision allele.
Analyze the genotypes: 'X^cX^c' indicates a female with two color blindness alleles, making her color blind. 'X^cY' indicates a male with one color blindness allele, making him color blind.
Consider the other genotypes: 'X^CY' represents a male with normal vision, and 'X^CX^c' represents a female carrier who has normal vision but carries one color blindness allele.
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