Answered: Sickle cell anemia is a human genetic…

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter14: Human Inheritance

Section: Chapter Questions

Problem 4GP: An allele responsible for Marfan syndrome Section 13.4 is inherited in an autosomal dominant...

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Question

Sickle cell anemia is a human genetic disorder caused by an autosomal recessive allele. A couple plan to marry
and want to know the probability that they will have an affected child. With your knowledge of Mendelian
inheritance, what can you tell them if (1) each has one affected parent and a parent with no family history of SCA
or (2) the man is affected by the disorder but the woman has no family history of SCA?

Features of a Concept Features of a Concept Characteristics are discrete; that is, they are unitary. Genetic features have alternative forms, and each feature is inherited from one of the two parents. These are called alleles. One allele is dominant over the other allele. The dominant allele is reflected in the phenotype. Random segregation creates the gametes. The heterozygotic individuals produce gametes with an equal frequency of both alleles. Genes are unlinked; that is, different traits arise from the independent assortment.

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