Only answer if youre sure cystic fibrosis is a recessive gene disorder. the pedigree chart for a family known to have cystic fibrosis is shown what percentage of the offspring either are carriers or have observable disease? 25% 50% 75% 100%

D. 100%.

Explanation:

Cystic Fibrosis is an Autosomic Recessive Disorder. The family pedigree chart shows that the Mother is a Carrier (Aa) and the Father has the disease (aa).

The offspring of both parents is affected by 100%.

75% have the disease (2 female, 1 male)

25% are carriers (1 male)

it is called an accent mark