10. A. In each human female cell, either the maternal or paternal X chromosomes is turned off by the activation of the XIST gene and by adding methyl groups to the chromosome. What do we call the inactivated X chromosome? B. How many Barr bodies does a normal male have? C. If a phenotypic male has a Barr body, then what does this tell you about his chromosomes?
10. A. In each human female cell, either the maternal or paternal X chromosomes is turned off by the activation of the XIST gene and by adding methyl groups to the chromosome. What do we call the inactivated X chromosome? B. How many Barr bodies does a normal male have? C. If a phenotypic male has a Barr body, then what does this tell you about his chromosomes?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:10.
A. In each human female cell, either the maternal or paternal X chromosomes is turned off by
the activation of the XIST gene and by adding methyl groups to the chromosome. What do we
call the inactivated X chromosome?
B. How many Barr bodies does a normal male have?
C. If a phenotypic male has a Barr body, then what does this tell you about his chromosomes?
D. If a phenotypic female does not have a Barr body, then what does this tell you about her
chromosomes?
E. Barr bodies are formed during embryonic development when the human embryo is a small
ball of cells. Once an X chromosome is turned off in a cell, every descendent of that cell will
have the same X chromosome turned off. This results in human females being a mosaic of two
kinds of cells. What does the word mosaic mean in this case?
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