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X chromosome inactivation in a diploid XX female is not completely inactivated, explain?

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter10: Control Of Gene Expression

Section: Chapter Questions

Problem 12SQ

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X chromosome inactivation in a diploid XX female is not completely inactivated, explain?

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In X-chromosome inactivation, when is the choice made as to which X chromosome is inactivated? Does this choice occur in embryonic cells, in adult somatic cells, or both?
Following X-chromosome inactivation, most of the genes on theinactivated X chromosome are silenced. Explain how. Name onegene that is not silenced.
Structurally, meiotic cohesins have different components than mitotic cohesins. This leads to what function differences?
Why is X chromosome inactivation important in female cells? (300 word limit)
Describe the molecular process of X-chromosome inactivation.This description should include the three phases of inactivationand the role of the Xic. Explain what happens to the X chromosomes during embryogenesis, in adult somatic cells, and duringoogenesis.
What is the spreading phase of X-chromosome inactivation? Whydo you think it is called a spreading phase?
In X chromosome inactivation... A-Why it is inactivated? B- How it is inactivated? C-Is the inactivation complete? D-Is it possible to observe any consequences for this inactivation?
Occasionally, a mouse X chromosome is broken into two pieces and each piece becomes attached to a different autosome. In this event, the genes on only one of the two pieces undergo X inactivation. What does this observation indicate about the mechanism of X-chromosome inactivation?
CdLS is usually caused by new mutation in oneparent’s gamete. Why?
If X inactivation compensates for an extra X chromosome, why do Klinefeltermales (XXY) have problems with development?
Thank you for the follow-up! So, in what sort of conditions would there be an extra Y chromosome? If it's not there in the first place.. how can it get transversed/moved to another chromosome? Unless it is duplicated?
Why is 26 incorrect