Tonya was recently diagnosed with cystic fibrosis which is an autosomal recessive disorder. Both of Tonya's parents are carriers for the disease.
What is the probability that Tonya's baby brother would have cystic
fibrosis *

25%

Explanation:

If you make a Punnett square from the heterozygous alleles that Tonya's parents must have if they are carriers there is a 25 percent chance that any child will inherit two of the recessive alleles. Cystic fibrosis is a recessive trait so there is a 25% chance Tonya's baby brother will have cystic fibrosis.

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