cystic fibrosis genetics
by mcbill

Question posed by Im Juzt Meh: genetics problem (biology)?
Monohybrid Crosses:
1. Cystic fibrosis is a genetic disorder that causes severe respiratory problems. Two normal, healthy people have a child with cystic fibrosis. what are the henotypes of the mother, father, and child? If this couple has several other childeren, what is the likelihood that they will have another child with cystic fibrosis?

Selected answer:

Answer by Alcaligenes
They both are carrying the allele for cystic fibrosis, which means they are both heterozygous for the gene. If you are studying Mendelian genetics, you probably recognize that some genes are recognized by letters. If we represent the parents as heterozygotes for cystic fibrous, the cross would look like this:

Cc x Cc

If only a cc will develop the disease, then it can be concluded that they have a 25% chance of having a baby with cystic fibrosis.

Good luck!!

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