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Julie and James were typically married couple. They have three children before James died of
cysctic fibrosis. The oldest son Jose and younger daughter Rosa both have cyctic fibrosis. Santa
the middle daughter is normal. Use the pedigree below to show the Genotypes of every person
and shade every shape that indicates if a person has the disease. Use the punnet square to show
the possible phenotypes of their children.

(1) What is the probability that Julie and James will have a child with cyctic fibrosis?
(2) Is Julie heterozygous or homozygous? Explain how do you know?

Sagot :

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