Question

cystic fibrosis is a condition that affects mucus. mucus is a jelly - like substance that certain cells produce to protect the body from infection. humans with cystic fibrosis produce mucus that is thicker and stickier than usual. this sticky mucus builds up in the lungs and interferes with breathing.
in a group of humans, some individuals have cystic fibrosis and others do not. in this group, the gene for the cystic fibrosis trait has two alleles. the allele for having cystic fibrosis (f) is recessive to the allele for not having cystic fibrosis (f).
complete the punnett square to show all possible genotypes of the offspring from a cross between two humans.

Explanation:

Step1: Combine first row and first column

For the first cell: combine \( F \) (from the column) and \( F \) (from the row), so the genotype is \( FF \).

Step2: Combine first row and second column

For the second cell: combine \( F \) (from the column) and \( f \) (from the row), so the genotype is \( Ff \).

Step3: Combine second row and first column

For the third cell: combine \( f \) (from the column) and \( F \) (from the row), so the genotype is \( Ff \).

Step4: Combine second row and second column

For the fourth cell: combine \( f \) (from the column) and \( f \) (from the row), so the genotype is \( ff \).

Answer:

	\( F \)	\( f \)
\( f \)	\( Ff \)	\( ff \)