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Write a pedigree in which there are parents and 4 children, 1 girl and 1 boy are color blind and the other girl and boy are not.

I HAVE A FEW QUESTIONS-

?- For a girl to be colorblind does her mother have to be colorblind too or just a carrier?her father?

?- If two people are heterozygous for sickle-cell anemia what are the chances that their children will have it ?(in ratio)

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