Question

Question 2: In red-green colorblindness, individuals cannot perceive the colors red and green in the same way as individuals with full color vision. Full color vision is coded by a dominant allele (B) on the X chromosome. Red-green colorblindness is caused by a recessive allele (b) on the X chromosome.

Identify the phenotype of a female with the genotype XBXb.
Identify the phenotype of a male with the genotype XBY.
Draw a Punnett square for the cross , and identify the following:
the percentage of offspring expected to be male and colorblind
the percentage of offspring expected to be female and colorblind
d. Explain why red-green colorblindness occurs more frequently in males than in females.

Answer 1

The answer is b

Step-by-step explanation:

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Answer 2

See the answers below.

Step-by-step explanation:

The phenotype of a female with the genotype
`X^BX^b` would be full color vision. Since color blindness is a recessive trait, the two X chromosome would need to have a recessive allele each in order for a female to be affected for color blindness.

The phenotype of a male with the genotype
`X^BY` would be full color vision. A recessive allele (b) on the X chromosome would be needed for a males to be affected for color blindness.

The Punnet square for the cross between the male and female is shown in the attached image.

Percentage of the offspring expected to be male and colorblind = 25% (1/4)

Percentage of the offspring expected to be female and colorblind = 0%

The red-green color blindness occurs more frequently in males than in females because males only have one X chromosome while females have two. Hence, males only require one affected allele in order to have the trait while females need two affected alleles.