Sickle cell problem

[Ryan Rigdon]

here is my problem along with my work. does it look good or should i go back and take another look at it.

Sickle cell anemia is an inherited disease in which red blood cells become distorted and deprived of oxygen. A person with two sickle cell genes will have the disease, but a person with only one sickle cell gene will have mild, non-fatal anemia called sickle cell trait. Using S to represent a healthy gene, and s the sickle cell gene, the table shows the four possibilities for the children of two Ss parents. Find the probability that these parents give birth to a child who has sickle cell trait.


Second Parent
S s

First S SS Ss

Parent s sS ss




My work: 4 total outcomes with 1 only having the sickle cell trait.

P(E) = n(E)/n(S) with n(S) = 4 and n(E) = 1

P(E) = 1/4 (final answer)

 

[Mrspi]

here is my problem along with my work. does it look good or should i go back and take another look at it.

Sickle cell anemia is an inherited disease in which red blood cells become distorted and deprived of oxygen. A person with two sickle cell genes will have the disease, but a person with only one sickle cell gene will have mild, non-fatal anemia called sickle cell trait. Using S to represent a healthy gene, and s the sickle cell gene, the table shows the four possibilities for the children of two Ss parents. Find the probability that these parents give birth to a child who has sickle cell trait.


Second Parent
S s

First S SS Ss

Parent s sS ss




My work: 4 total outcomes with 1 only having the sickle cell trait.

P(E) = n(E)/n(S) with n(S) = 4 and n(E) = 1

P(E) = 1/4 (final answer)

I think you need to go back and take another look.

The explanatory information in the problem says A person with two sickle cell genes will have the disease, but a person with only one sickle cell gene will have mild, non-fatal anemia called sickle cell trait.

"only one sickle cell gene" would be the pair Ss or the pair sS. How many of THOSE are in your chart?

 

[Ryan Rigdon]

P(E) = n(E)/n(S) with n(S) = 4 and n(E) = 2

P(E) = 1/2 (final answer)

 

[Mrspi]

P(E) = n(E)/n(S) with n(S) = 4 and n(E) = 2

P(E) = 1/2 (final answer)

I agree.