In humans, one X chromosome in females is inactivated. Why does a female with one X chromosome show Turner syndrome? What is the difference between two X chromosomes with one X inactivated and one X chromosome in a female?

In humans, one X chromosome in females is inactivated. Why does a female with one X chromosome show Turner syndrome? What is the difference between two X chromosomes with one X inactivated and one X chromosome in a female?

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 3CT: Almost all calico cats (one is pictured in FIGURE 10.7B) are female. Why? B When this calico cat was...

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2) In humans, one X chromosome in females is inactivated. Why does a female with one X chromosome show Turner syndrome? What is the difference between two X chromosomes with one X inactivated and one X chromosome in a female?

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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?
1. During the Human Genome Project, scientists learned that most of the human genome A. doesn't code for proteins. B. is located on sex chromosomes. C. isn't inherited. D. codes for proteins. 2 Tortoiseshell cats have different alleles for fur colors on their X chromosomes, with different X chromoson bein activate different cells, a phenomenon called A X-inactivation. B. X-expression. C. X-activation. D. Y-inactivation. 3 Consider that people with blue eyes must have two alleles for blue eyes since blue eye color is a recessive trait. A blue-eyed person and a brown-eyed person have an offspring with blue eyes. The brown-eyed person must A. have two alleles for blue eyes. B. have two alleles for brown eyes. C. not have the dominant brown eye allele. D, have one allele for blue eyes and one allele for brown eyes.
4) Explain why you can NOT typically have a Male Calico cat. 5) Can you think of any unusual situation where you might be able to have a Male Calico cat? Explain how this might occur 6) Explain how X chromosome inactivation takes place in mammals at the chromosomal and molecular level. B. What genes are involved in inactivating a human X chromosome? C. What role does X chromosome-specific inactivating transcript --XIST-- non coding RNA play in the inactivation of the human X chromosome.
Almost all calico cats (one is pictured in FIGURE 10.7B) are female. Why? B When this calico cat was an embryo, one of the two X chromosomes was inactivated in each of her cells. The descendants of the cells formed her adult body, which is a mosaic for expression of X chromosome genes. Black fur arises in patches where genes on the X chromosome inherited from one parent are expressed; orange fur arises in patches where genes on the X chromosome inherited from the other parent are expressed. FIGURE 10.7 Animated X chromosome inactivation.
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?
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?
1. The location of hemophilia C- factor XI is 4q35, where exactly is it? Describe.2. Referring to image of chromosome 16 provided, indicate the exact location of the geneslabeled a-k:
Outline the molecular steps in the process of X-chromosomeinactivation (XCI). Which step plays a key role in choosing whichof the X chromosomes will remain active and which will beinactivated?
What is the spreading phase of X-chromosome inactivation? Whydo you think it is called a spreading phase?
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.
You engineer a chromosomally XY mouse in which SRY gene is inactivated. What do you expect to observe in this mouse? a) the mouse will develop male anatomical feautures b) the mouse will develop female anatomical feautures c)the mouse Y chromosome will convert into an X chromosome d) the mouse X chromosome will convert into a Y chromosome e) the mouse will exhibit an additional X chromosome making it XXY
Following X-chromosome inactivation, most of the genes on theinactivated X chromosome are silenced. Explain how. Name onegene that is not silenced.