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Red-green colorblindness is a inherited disorder in which individuals have trouble distinguishes
between red and green (or brown and orange) and often confuse blue and purple hues. This
condition is usually found in males, as it is located on the X chromosome.
A man with red-green colorblindness has one brother who has normal version. From which parent did the man inherit colorblindness? Explain how you know using a Punnett square to © 2014 Vanessa Jason (“Biology Roots”
back up your answer.

Sagot :

Oseniidn

Since the colorblindness is located on the X chromosome, the man must have inherited his colorblindness from his mother.

X-linked traits

Women are XX while men are XY.

Also, the X chromosome in XY always comes from the mother.

Since the man is affected for colorblindness but his brother is not, it means that only one X chromosome of the mother is affected while the father can be affected or otherwise.

Assuming the father is free from colorblindness and the allele is represented by c:

          [tex]X^cX[/tex]    x    [tex]XY[/tex]

      [tex]X^cX[/tex]    [tex]X^cY[/tex]    [tex]XX[/tex]    [tex]XY[/tex]

Thus, the man's genotype is  [tex]X^cY[/tex] and it comes from the mother.

More on X-linked traits can be found here: https://brainly.com/question/9830755

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