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 cell

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 cell

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter7: Development And Sex Determination

Section: Chapter Questions

Problem 19QP: Equalizing the Expression of X Chromosome Genes in Males and Females Individuals with an XXY...

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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.
Equalizing the Expression of X Chromosome Genes in Males and Females Individuals with an XXY genotype are sterile males. If one X is inactivated early in embryogenesis, the genotype of the individual effectively becomes XY. Why will this individual not develop as a normal male?
In an XXYY human: two X chromosomes are inactivated in every cell one X chromosome is inactivated in each somatic cell none of the X chromosomes are inactivated in each somatic cell two X chromosomes are inactivated in each somatic cell
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Cape parrots are found in forests in South Africa. In a study of Cape parrot genetics, biologists produced the karyotype shown from somatic cells of a female Cape parrot. an nk on an nN n 1 2 3 4 5 6 7 an nn 8 9 10 12 13 14 15 • . 16 17 18 19 20 21 22 23 24 25 26 27 28 Z W 29 Female Sex Chromosomes
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A sexually reproducing organism has the following phenotype DdEeAaTt. The D and E loci are on the same arm of a metacentric chromosome in the cis configuration. The A locus is on the long arm of an acrocentric chromosome and the T locus is on a telocentric chromosome. There are no other chromosomes. Show a diagram of the cell in metaphase of mitosis and the result of mitosis.
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somatic cells males a normal amount of one too many sex chromosomes excess females infertility death the germ line autosomes one too few Humans who have aneuploidy of the sex chromosomes are viable. A human who has the Klinefelter syndrome (XXY) has the normal number of and will produce the normal amount of proteins from gene on autosomes. A person who has Klinefelter syndrome (XXY) has X chromosomes, one of which will condense into a Barr body in somatic cells. Most X chromosome genes produce protein. The few genes in the PAR region of the X chromosome remain active and those genes produce XXY somatic cells, leading to skeletal abnormalities in with Klinefelter syndrome. protein in the In the Barr body is reactivated. The higher dose of X chromosome gene expression in the XXY male germ line leads to defective spermatogenesis and
A somatic cell has the genotype DdEe. All chromosomes in this organism are metacentric. Show metaphase and the results of mitosis if the D and E locus are linked on the same chromosome in trans configuration. A sexually reproducing organism has the following phenotype DdEeAaTt: The D and E loci are on the same arm of a metacentric chromosome in cis configuration. The A locus is on the long arm of an acrocentric chromosome and the T locus is on a telocentric chromosome. 2.1. What is the haploid number of this organism? 2.2. Using diagrams show a ceii at metaphase of mitosis and show the results of mitosis.
S chahpant &yele checkpoints. *sler chrama hids vs chromag nid URITesis (and cleavage furrow prorse Cheta point M phase (mitosis) Chedfont2 o-never Sunde ogan G2 phase (Gap 2) G1 phase (Gap1) u ses chrome20ves Thecell ycle ntendhase is nat n meitosis, ts or. J0 Sphase (DNA synthesis) GO phase (end of cell cycling) nLero 2. Refer to the above diagram. What are the main events of each of the phases of the cell cycle as seen above? Phase Main Events G1 G2 GO