Which of the following genotypes represent color blind individuals?

• A. X^cX^c
• B. X^cY
• C. X^CY
• D. X^CX^c

Answer: (B)

Verified step by step guidance

1. 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.
2. 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.
3. Identify the notation used for the alleles: 'X^c' represents the allele for color blindness, and 'X^C' represents the normal vision allele.
4. 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.
5. 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.