Normal color vision (XM) is dominant over color blindness (X"). Suppose a color-blind man fathers the children of a woman with the genotype XNXN. a. What genotype is the father?. b. What proportion of daughters will be color-blind? c. What proportion of sons will be color-blind? .

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7. The sex chromosomes bear alleles for traits, just like the other chromosomes in our bodies. Genes that
occur on the sex chromosomes are said to be sex-linked. More specifically, the genes present on the X
chromosome are said to be X-linked. Many more genes are present on the X chromosome than are found
on the Y chromosome. Nonetheless, those genes found on the Y chromosome are said to be Y-linked.
The Y chromosome is smaller than its homologue, the X chromosome. Consequently, most of the loci
present on the X chromosome are absent on the Y chromosome.
In humans, color vision is X-linked; the gene for color vision is located on the X chromosome but is
absent from the Y chromosome.
Normal color vision (XM) is dominant over color blindness (X"). Suppose a color-blind man fathers the
children of a woman with the genotype XNXN.
a. What genotype is the father? .
b. What proportion of daughters will be color-blind?
c. What proportion of sons will be color-blind?.
Transcribed Image Text:7. The sex chromosomes bear alleles for traits, just like the other chromosomes in our bodies. Genes that occur on the sex chromosomes are said to be sex-linked. More specifically, the genes present on the X chromosome are said to be X-linked. Many more genes are present on the X chromosome than are found on the Y chromosome. Nonetheless, those genes found on the Y chromosome are said to be Y-linked. The Y chromosome is smaller than its homologue, the X chromosome. Consequently, most of the loci present on the X chromosome are absent on the Y chromosome. In humans, color vision is X-linked; the gene for color vision is located on the X chromosome but is absent from the Y chromosome. Normal color vision (XM) is dominant over color blindness (X"). Suppose a color-blind man fathers the children of a woman with the genotype XNXN. a. What genotype is the father? . b. What proportion of daughters will be color-blind? c. What proportion of sons will be color-blind?.
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