46. cystic fibrosis (cf) is a genetic disorder caused by a recessive allele (f). the allele for normal lung…

46. cystic fibrosis (cf) is a genetic disorder caused by a recessive allele (f). the allele for normal lung function (f) is dominant over the allele for cystic fibrosis.\none parent who is a carrier for cystic fibrosis has a child with a parent with cystic fibrosis.\nwhat percentage of their children are expected to have cystic fibrosis?\nrecord your answer as a whole number percent.

46. cystic fibrosis (cf) is a genetic disorder caused by a recessive allele (f). the allele for normal lung function (f) is dominant over the allele for cystic fibrosis.\none parent who is a carrier for cystic fibrosis has a child with a parent with cystic fibrosis.\nwhat percentage of their children are expected to have cystic fibrosis?\nrecord your answer as a whole number percent.

Answer

Explanation:

Step1: Identify parental genotypes

Carrier parent: $Ff$; Affected parent: $ff$

Step2: Set up Punnett square

$$ \begin{array}{c|cc} & F & f \ \hline f & Ff & ff \ f & Ff & ff \ \end{array} $$

Step3: Calculate affected offspring ratio

Number of $ff$ genotypes: 2 out of 4 total. Ratio = $\frac{2}{4} = 0.5$

Step4: Convert ratio to percentage

$0.5 \times 100 = 50$

Answer:

50