A mammalian female's ___________________________.
A) cells usually have multiple Barr bodies
B) body is a mosaic for the X-linked traits she inherits
C) Barr bodies are active in some cells
D) Barr bodies are produced after puberty
E) X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell

Question

A mammalian female's ___________________________.  
A) cells usually have multiple Barr bodies
B) body is a mosaic for the X-linked traits she inherits
C) Barr bodies are active in some cells
D) Barr bodies are produced after puberty
E) X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell

Quizplus · Accepted Answer

A mammalian female's body is a mosaic for the X-linked traits she inherits due to X-chromosome inactivation which results in the formation of Barr bodies. Each cell in a female's body randomly inactivates one of its X chromosomes, leading to the expression of genes from only one X chromosome in a given cell. As a result of this, different cells in a female's body may express different X-linked traits based on which X chromosome is active.

A Mammalian Female's ___________________________