handrew7
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Cystic fibrosis is a recessive gene disorder. The pedigree chart for a family known to have cystic fibrosis is shown below.

A half shaded circle is shown connected by a straight line to an unshaded square. Underneath the half shaded circle are the letters Aa which represent the genotype for the first parent. Underneath the second parent the letters, AA, appear representing the genotype for the other parent. Below this is another row of circles and squares. This 2nd row represents the offspring. Starting from the left a half shaded circle is shown connected to an unshaded square, followed by an unshaded square, and then an unshaded circle. Each of the circles and squares, offspring, are connected by a horizontal straight line that connects to the parent group above. The genotype is written under each of the offspring in order from left to right; Aa, AA, AA, AA.

What percentage of the offspring have observable disease?

0%
25%
50%
75%

Answer :

75% because there are three AA's and 3out of 4 is 75


lhmarianateixeira

The percentage of the offspring have observable disease is 75%.

How to calculate percentage in genetics?

Thus, the probability of the second child being female is also 1/2. To find the probability that one child of the couple is a boy and the other is a girl, we use the “e” rule and multiply the two probabilities: 1/2 x 1/2= 1/4 or 0.25.

Probability theory says that the probability of two or more independent events occurring together is equal to the product of the probabilities of them occurring separately. In this case the percentasge is 75%.

See more about genetics at brainly.com/question/12985618

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