(Solved) Human Pedigree

siermo

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12 years ago

Based on this pedigree, (see attached photo)

A. The probability that individual II-5 is a carrier is 50%
B. If individual II-1 is a carrier, there is a chance 50% that her male child will have red-green colorblindness.
C. It is impossible to determine whether II-5 is a carrier.
D. If individual III-3 is a carrier, all her female children will have red-green color blindness.

This is an autosomal dominant pedigree is it not? Color blindness is X-linked. And if you're affected, you're obviously 100% carrier. So I'm confused...what am I missing??

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zoeksyrianos

wrote...

12 years ago

Quote from: siermo (12 years ago)

B. If individual II-1 is a carrier, there is a chance 50% that her male child will have red-green colorblindness.

This makes sense to me.

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andrearo

wrote...

12 years ago

Autosomal dominant tells us that the disease would be present in every generation (does not apply to your pedigree). Also, keep in mind that autosomal chromosomes are the "regular" chromosomes, when we think of an autosomal dominant or recessive disorder we exclude the sex chromsomes (the ones responsible for x-linked disorders).

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siermo Author

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12 years ago

Thank you!

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duddy

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Staff Member

12 years ago

Please mark as solved if you're satisfied with the answer.

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