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, Problem 5TY
According to Mary Lyon’s hypothesis, the patchwork pattern on a calico cat can be explained by which of the following?
- One of the X chromosomes is converted to a Ban body in somatic cells of female mammals.
- One of the X chromosomes is converted to a Ban body in all cells of female mammals.
- Both of the X chromosomes are converted to Ban bodies in somatic cells of female mammals.
- Both of the X chromosomes are converted to Ban bodies in all cells of female mammals.
- One of the X chromosomes is lost in the somatic cells of female mammals.
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Which of the following statements regarding X-inactivation is TRUE?(posted)
Inactivated X chromosomes are only found in somatic cells of females.
After X-inactivation happens in a cell, all daughter cells resulting from mitotic events of that cell will have the same X chromosome ina none of the statements listed here are true
X-inactivation is a random event that happens during human development right before a fetus is born. all of the statements listed here are true)
Which of the following statements does not accurately complete this statement: An epigenetic trait _________.
can be passed from mother cell to daughter cell by mitosis
can be passed to the next generation by meiosis
is a change in the DNA sequence
causes changes in gene expression
All are accurate
Of the following, which is a good example of epigenetic changes?
methylation of DNA bases
addition of acetyl groups to histones
CpG islands
imprinting of genes
All are good examples of epigenetic changes
X-Chromosome Inactivation in mammals results in the formation of what structures that can be seen in the nucleus?
a
Spliceosomes
b
Mitochondria
c
Nuclear Envelope
d
Barr Bodies
e
Nuclear Colorations
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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- A panel of cell lines was created by human–mouse somatic-cell hybridization. Each line was examined for the presence of human chromosomes and for the production of an enzyme. The following results were obtained:On the basis of these results, which chromosome has the gene that encodes the enzyme?arrow_forwardIn some insects the female have two x chromosomes, while the males have One x chromosomes and no y chromosome .if the normal deploid number in an insect of this type is 14 what would be the number of chromosomes in the body cells of males and of females?arrow_forwardFigure 19.25 shows that the Sxl protein binds to the mRNA of the msl-2 gene, inhibiting translation of the mRNA’s proper reading frame. The MSL-2 protein is a transcription factor that binds to the X chromosome in XY males to double the level of X-linked gene transcription, thus equalizing X-linked gene expression in XY males and XX females. a. In which sex, XY males or XX females, would the Sxl protein bind to the msl-2 mRNA? b. As discussed in Problem 35, some Sxl alleles are lethal to females and others are lethal to males. Is the function of Sxl in regulating the synthesis of Msl-2 protein sufficient to explain the sex-specific lethality caused by both kinds of alleles? c. Predict the effect of loss-of-function mutations in msl-2 on male and female fertility and viability.arrow_forward
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- Which of the following statements is FALSE? Inactivation of one of the two X chromosomes in the somatic cells of mammalian females..... a. underlies the Calico phenotype in cats. b. leads to cellular mosaicism in females heterozygous for an X-linked gene. c. affects 75 % of the paternal and 25 % of the maternal X-chromosomes of a mammalian body. d. leads to the formation of a Barr body in female cells' nuclei. e. is the mechanism in mammals to compensate for the higher dosage of X-linked genes in females as compared to males.arrow_forwardWhat terms can be used to describe a fruit fly that has a total of 7 chromosomes because it is missing one copy of chromosome 3?arrow_forwardColorblindness and hemophilia are both X-linked traits in humans. Explain how a female who has a defective color vision gene on one X chromosome and a defective blood clotting gene causing hemophilia on the other X chromosome can be neither a hemophiliac nor colorblind? Please discuss the effect of Gene dosage compensation in your answer and in your answer describe the molecular process by which this occurs.arrow_forward
- The Chromosome Theory Integrates which Aspects of Gene Behavior?arrow_forwardA couple attends a medical consultation for infertility problems and repetitive abortions. The doctor suspects that the problem is due to a mutation, that is why he requires a study in which chromosomes can be visualized, and which reflects if there are any alterations in structure and number. What procedure could he use to obtain this information? Group of answer choices Hydrolysis Locus Karyotype In vitro fertilization The upper extremities of the whale, the bat, the cat, the horse and the man, fulfill in some the function of fins to swim, in others the function of wings to fly, and legs or arms in the case of the man, but all of them maintain the same structure with the same number of bones. This allows us to identify a common ancestor in these groups. What evidence of evolution does the example refer to? Group of answer choices Vestigial organs Converging characteristics Homologous organs Analogous organs Both tubers and potatoes contain a large amount of starch,…arrow_forwardConsider a liver cell. How many chromosomes are present and how many alleles of each gene are present?arrow_forward
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