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What must be true of a person with cystic fibrosis?
a. At least one parent was a carrier for cystic fibrosis.
b. The mother was a carrier for cystic fibrosis.
c. One of the parents had the condition cystic fibrosis.
d. Both parents had at least one allele for cystic fibrosis.

Answer :

The answer is D. For future use you can use a punnet square to help you if need.

Answer:

D. here is a picture to help you-

hope this helps

View image Аноним

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