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The following was gathered on
color blindness in one family. Color blindness in humans is an
X-linked recessive trait.
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The following was gathered on
color blindness in one family. Color blindness in humans is an
X-linked recessive trait.- Indicate the genotypes for individuals 1 and 2 in generation I.
- Would it ever be possible for individuals 2 and 4 in generation II to have a child with normal vision? Explain why or why not.
- If individual 8 had a child, what would be the probability of the child having normal vision?
Homework Answers
4.
a. To be colour blind one person must have two recessive gene for colour blindness. As I-2 is a colour blind female, her genotype will be cc. Genotype of I-1 will be Cc as he is a carrier for colour blind gene.
b. Yes. It is possible that II-2 and II-4 may have child with normal vision. They both are cc because they are colour blind. They always give their child colour blind gene (c). If they marry normal or carrier female (CC or Cc), their children may have the genotype Cc, and therefore their child will be normal (carrier).
c. III-8 is colour blind , so he has genotype cc. He always give his child c allele (responsible for colour blindness). If his wife donate C allele , their child will be normal (Cc- carrier) and if his wife give c allele to their child, the child will be colourblind (cc).So there is 50% probability that their child have normal vision(Cc).
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