Ask Question
7 May, 09:14

Red-green color blindness is an X-linked recessive trait in humans. The dominant Xcn allele produces normal color vision, while the recessive Xcb allele produces color blindness. If a color-blind woman mates with a man who has normal color vision (P generation), what proportions of genotypes/phenotypes do you expect to see in their children (F1 generation) ?

+3
Answers (1)
  1. 7 May, 12:53
    0
    One half of their offspring will be girls with normal vision, and one half of their offspring will be color blind boys.

    Explanation:

    Red-green color blindness is an X-linked recessive trait. The dominant Xcn allele produces normal color vision, while the recessive Xcb allele produces color blindness. Women have two X chromosomes, men have one X and one Y chromosomes.

    The possible genotypes and phenotyes for this trait are:

    XcnXcn: normal woman XcnXcb: normal woman XcbXcb: color blind woman XcnY: normal man XcbY: color blind man.

    A color-blind woman (XcbXcb) mates with a man with normal color vision (XcnY).

    The woman only produces Xcb gametes, while the man produces two types of gametes: Xcn and Y.

    The possible genotypes and phenotypes of their children resulting from the combination of those gametes are:

    1/2 XcbXcn: normal vision daughters 1/2 XcbY: color blind sons

    One half of their offspring will be girls with normal vision, and one half of their offspring will be color blind boys.
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “Red-green color blindness is an X-linked recessive trait in humans. The dominant Xcn allele produces normal color vision, while the ...” in 📙 Biology if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers