Question

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1. The Punnett Square shows the cross between two parents who are carriers for sickle cell anemia, a recessive genetic disorder that affects the red blood cells in humans.



The probability that these parents will have an offspring affected with sickle cell anemia is ______.

A. 50
B. 75
C. 100
D. 125


2. Using the same Punnett Square, what is the probability that the offspring will be carriers like the parents?

A. 100
B. 25
C. 75
D. 50

Answer 1

Question 1 - 25%

Question 2 - 50%

Step-by-step explanation:

Answer 2

Question 1 - 25%

Question 2 - 50%

Step-by-step explanation:

Question 1:

Because sickle cell anemia is a recessive disorder, any genotype with two recessive (ss) alleles will represent the phenotype. Because the Punnett square shows only one ss genotype out of four, the probability that the parents will have an offspring affected with sickle cell anemia is 25%

Question 2:

To be a carrier of a genetic trait, one must both have the dominant and recessive alleles (Ss). Because there are two Ss genotype out of four, the probability that the parents will have offspring affected with sickle cell anemia is 50%