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 F is for not having cystic
fibrosis, and the allele f is for having cystic fibrosis.
Gabriel, a human from this group, does not have cystic fibrosis. Gabriel has one allele for not
having cystic fibrosis and one allele for having cystic fibrosis.
Based on this information, click the blue words to correct any errors in the text.
Gabriel is heterozygous for the cystic fibrosis gene.
Gabriel's genotype for the cystic fibrosis gene is FF.
Gabriel does not have cystic fibrosis. This is Gabriel's genotype for the cystic
fibrosis trait.