Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 16.3, Problem 2TYK
Which of the following statements regarding X-chromosome inactivation is false?
- Xic is the site where X-chromosome inactivation begins.
- Xic is where the Xist gene is located.
- The Xist gene on the inactivated X chromosome (the Barr body) is not expressed.
- The product of the Xist gene coats the inactivated X chromosome.
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Which of the following best describe(s) the process of X-inactivation?
Group of answer choices
It occurs because females have more genetic information than males.
It occurs because males have more genetic information than females
It occurs only in birds.
It does not change the appearance inactivated chromosomes.
Under what condition might a human male have the XX sex chromosome complement?
It is not possible.
She has an X chromosome lacks an active Xist gene.
He has an X chromosome that carries an SRY gene.
He has a mutation that renders the SOX9 gene non-functional.
He has a mutation that renders the SRY gene non-functional.
Which of the following statements is INCORRECT?
Synapsis of the X and Y chromosomes in males occurs only at the pseudoautosomal regions.
Genes in the pseudoautosomal regions on the Barr body X chromosome escape inactivation.
Nonhomologous regions of the X and Y chromosome condense to form a sex vesicle during leptotene.
Although one of the two X chromosomes in XXY males becomes a Barr body, XXY males have three doses of the genes in the PAR regions.
Chapter 16 Solutions
Principles of Biology
Ch. 16.1 - Which of the following is an epigenetic change...Ch. 16.2 - If you crossed an Igf 2 Igf 2- male mouse to an...Ch. 16.2 - Prob. 1TYKCh. 16.2 - Prob. 2TYKCh. 16.3 - Prob. 1CCCh. 16.3 - Prob. 1TYKCh. 16.3 - Which of the following statements regarding...Ch. 16.4 - Prob. 1TYKCh. 16.4 - Prob. 2TYKCh. 16.5 - Prob. 1BC
Ch. 16.5 - Prob. 1CCCh. 16.5 - Prob. 1TYKCh. 16.5 - Prob. 2TYKCh. 16.6 - Prob. 1CCCh. 16.6 - Prob. 1BCCh. 16.6 - Prob. 1TYKCh. 16.6 - Genes that are linked do not conform to Mendels...Ch. 16 - Which of the following is an example of an...Ch. 16 - In mice, the allele of the Igf2 gene that is...Ch. 16 - Prob. 3TYCh. 16 - The marking process for genomic imprinting...Ch. 16 - According to Mary Lyons hypothesis, the patchwork...Ch. 16 - Prob. 6TYCh. 16 - Prob. 7TYCh. 16 - Prob. 8TYCh. 16 - Prob. 9TYCh. 16 - Prob. 10TYCh. 16 - Prob. 1CCQCh. 16 - Prob. 2CCQCh. 16 - Prob. 3CCQCh. 16 - Prob. 1CBQCh. 16 - Prob. 2CBQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- If a woman is a carrier of a certain x linked disease and one of her X chromosomes is turned off in each cell how is it she doesn't have the disease?arrow_forwardWhich of the following statements is false? Dosage compensation is accomplished in humans by stimulation of gene expression from the single X chromosome. Dosage compensation is accomplished in humans by inactivating a female X chomosome. An individual with Turner Syndrome has no Barr bodies. An individual with Klinefelter syndrome generally has one Barr body. A typical XX human female has one Barr body.arrow_forwardIn fruit flies, dosage compensation is achieved bya. X-chromosome inactivation.b. doubling the expression of genes on the single X chromosome in the male.c. decreasing the expression of genes on the two X chromosomes by 50% in the female.d. all of the above.arrow_forward
- If X inactivation in humans shuts down extra X chromosomes, why do XXY and XXX individuals display abnormal phenotypes? Group of answer choices Some X linked genes escape inactivation In trisomies, all the X chromosomes are shut down X inactivation can only shut down one X per cell The extra Barr body (condensed X) takes up physical space in the cellarrow_forwardBriefly describe the molecular processes that cause one X chromosome in each female cell to be active and the other X chromosome to be inactivated.arrow_forwardWhat is a Barr body? How is its structure different from that ofother chromosomes in the cell? How does the structure of a Barrbody affect the level of X-linked gene expression?arrow_forward
- How does X inactivation contribute to a person’s phenotype? a. It controls the number and kind of genes inherited on an X chromosome. b. It determines which X chromosome is expressed in a male. c. It allows for the expression of either the maternal or the paternal X in different cells. d. It enhances the expression of Y-linked genes in males.arrow_forwardWhich of the following statements is TRUE? Overexpression of the X-chromosome in the somatic cells of males a. leads to the formation of a Barr body in male cells' nuclei. b. leads to cellular mosaicism in males hemizygous for an X-linked gene. c. is characteristic of all XY systems of sex determination. d. is the mechanism in flies to compensate for the higher dosage of X-linked genes in females as compared to males. e. None of the abovearrow_forwardWhich of the following could explain how might a human having the XX sex chromosomes can develop as a male? Both of his X chromosomes become inactivated giving rinse to a male. The autosomal Sox9 gene is inactivated in the male. This is not possible. His father suffered a chromosomal translocation in the reproductive cells that moved the SRY region to the X chromosome. The ratio of X chromosomes to haploid sets of chromosomes has been altered.arrow_forward
- The gene for colorblindness is 1 - located on the X chromosome 2 - located on the both X and Y chromosome 3 - located on the Y chromosome 4- located on a autosomearrow_forwardIn dosage compensation, do males sometimes overcompensate or is it always Barr body X-chromosome inactivation for females?arrow_forwardBarr bodies area. genetically active X chromosomes in males.b. genetically inactive X chromosomes in females.c. genetically active Y chromosomes in males.d. genetically inactive Y chromosomes in females.arrow_forward
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