Question

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%

Answer 1

The answer is 100%. Three are observable, but the fourth is just a carrier.

Answer 2

Answer: D. 100%.

Step-by-step 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)