Part 4: sex-linked inheritance—predicting color blindness in offspring
recall that females have two x chromosomes: one from the mother and one from the father. males have one x chromosome and one y chromosome; the x chromosome comes from the mother, and the y chromosome comes from the father. traits associated with genes located on the sex chromosomes are called sex-linked traits.
individuals with the sex-linked condition called red-green color blindness do not perceive the colors red and green. red-green color blindness is caused by the recessive allele c and is carried on the x chromosome. the dominant allele for normal color vision is c. when an x chromosome contains the dominant allele, the allele is written as xc. when an x chromosome contains the recessive allele, the allele is written as xc.
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1. what is the genotype of a male with red-green color blindness?


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2. what is the genotype of a female who is not color-blind but is a carrier of red-green color blindness?


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3. even though red-green color blindness is a recessive trait, can a female have red-green color blindness? explain.


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4. a man who is color-blind marries a woman who is not color-blind and is not a carrier of the allele for color blindness. create a punnett square to predict the possible genotypes of their children.

part 4 punnett square

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5. will all of the female children be carriers of the color-blind allele, or will none be carriers? explain.


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6. will all of the male children be color-blind, or will none be color-blind? explain.