Another practice question help!

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SOrry I have to ask here. its because the practice questions im doing dont have rationales so i am left to figure them out myself.

So, long story short...

parents with 2 children with sickle cell disease ask the nurse why both children have the disease.

the answer: each child has 25% chance to inherit the trait from both parents..

i thought it was 50% to inherit the trait and 25% to inherit the disease...

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Specializes in MICU.

Children with sickle cell disease = SS (one in four, or 25 percent)

Children who are carriers of the gene like their parents = AS SA (two in four, or 50 percent have "sickle cell trait")

Children who do not get the gene from either parent: AA (one in four, or 25 percent)

PS.: This is just for one child. so based on your question it means both kids are SS

sicklecell.gif

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Specializes in MICU.

The problem with your question is that you didnt specify whether the parent has the trait or the disease. However, I used punnett square to predict the answer above and I assumed the question says both parent have sickle cell trait.

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The problem with your question is that you didnt specify whether the parent has the trait or the disease. However, I used punnett square to predict the answer above and I assumed the question says both parent have sickle cell trait.

the question didnt have that detail. i think it was just a problem with the way it was made or written.

i do understand now. thanks for the picture @loveofrn!

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Specializes in Pedi.
SOrry I have to ask here. its because the practice questions im doing dont have rationales so i am left to figure them out myself.

So, long story short...

parents with 2 children with sickle cell disease ask the nurse why both children have the disease.

the answer: each child has 25% chance to inherit the trait from both parents..

i thought it was 50% to inherit the trait and 25% to inherit the disease...

It is a 25% chance to inherit the trait from BOTH parents, two copies of the trait = disease. There is a 50% chance that each child will inherit the trait from one parent and be a carrier and a 25% chance that the child will not inherit the trait.

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It is a 25% chance to inherit the trait from BOTH parents, two copies of the trait = disease. There is a 50% chance that each child will inherit the trait from one parent and be a carrier and a 25% chance that the child will not inherit the trait.

Oh Thank you! The answer i was really looking for!!

Its not just critical thinking in nursing. You apparently have to be good in english grammar and stuff. lol

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