Sickle cell disease is an inherited blood disorder that affects red blood cells. Since it is a recessive disorder, a person inheriting two sickle cell genes will have the disease, whereas a person inheriting only one sickle cell gene will be healthy, but will carry the sickle cell trait. If both parents have the sickle cell trait, and it is equally likely whether a parent passes on the gene for sickle cell trait, determine the probability that an offspring will have the disease. an offspring will have the sickle cell trait. an offspring will have neither sickle cell anemia nor the sickle cell trait.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Sickle cell disease is an inherited blood disorder that affects red blood cells. Since it is a recessive disorder, a person inheriting two sickle cell genes will have the disease, whereas a person inheriting only one sickle cell gene will be healthy, but will carry the sickle cell trait. If both parents have the sickle cell trait, and it is equally likely whether a parent passes on the gene for sickle cell trait, determine the probability that

  1. an offspring will have the disease.

  2. an offspring will have the sickle cell trait.

  3. an offspring will have neither sickle cell anemia nor the sickle cell trait.

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