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Cystic fibrosis is a deadly disease of the lungs and digestive system. It is inherited as a recessive trait. How can two healthy parents have a child with cystic fibrosis?

Respuesta :

Supernova
We'll make the alleles: Cc.

C is a healthy parent, and c is the cystic fibrosis (recessive).

If you make a punnett square and the parents are both Cc (healthy), then you would get CC, Cc, Cc, and cc. That cc is a 25% chance that the offspring will have that, which means there is a 25% chance the child will have cystic fibrosis.

Two healthy parents can have a child with cystic fibrosis if both the parents have the dominant allele and recessive allele, if both the parents have heterozygous alleles.
Mitanshu
They are both heterozygous for the gene. If you do a pun net square, you will find that they would have a 25% chance of having a child with Costco fibrosis.

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