10th Edition
ISBN: 9781305967359




10th Edition
ISBN: 9781305967359
Textbook Problem

A trait that is present in a male child but not in either of his parents is characteristic of _______ inheritance.

a. autosomal dominant d. It is not possible to answer this question without more information.
b. autosomal recessive
c. X-linked recessive

Summary Introduction


Inheritance pattern describes the transmission of particular disease in families. It is classified as “autosomal dominant, autosomal recessive, X-linked dominant and X-linked recessive.”


Reason for correct answer:

Option d. is given as “It is not possible to answer this question without more information.”

The trait present in a male child might be due to autosomal recessive allele in both the heterozygous parents or X-linked recessive allele in mother. Therefore, the correct answer cannot be predicted due to incomplete information.

Reason for incorrect answer:

Option a. is given as, “autosomal dominant.”

In case of autosomal dominance, a trait associated with a dominant allele on an autosome is expressed in individuals who are heterozygous and homozygous for that trait. This indicates that the trait in the male child is not due to autosomal dominant inheritance.

Hence, option a. is incorrect.

Option b. is given as, “autosomal recessive.”

In case of autosomal recessive inheritance, a recessive allele on an autosome is expressed only in homozygous individuals. Heterozygous individuals are called carriers because they do not have the associated trait...

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