Question

Sickle cell anemia is known to run in a family. A pedigree chart for this family is shown below.

The parents are shown at the top and from left to right appear as a half-shaded circle next to a half shaded square.The two are connected by a straight line. Below the parent pair is a vertical straight line connecting the next row of circles and squares which are the offspring. Starting from the left an unshaded square, half-shaded circle, another half-shaded circle and a completely shaded square are shown. All these are also connected by a horizontal straight line.

What percentage of the offspring have sickle cell anemia?

0%
25%
50%
100%

Answer 1

50% because you have one completely shaded square and two half shaded so together that’s 50

Answer 2

I'm pretty sure it's 25% because from what i remember, 50% was wrong. I know, science sometimes makes no sense lol

Step-by-step explanation:

It isn't 0% or 100% So 25% please do not review answer unless you took the quiz and found out it was correct or not. But i hope you get it right :)