Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 8.6, Problem 2COMQ
Summary Introduction
Introduction:
Aneuploidy is thevariation in the number of chromosomes in the nucleus of the cell in a total set of chromosomes. It mainly occurs when chromosomal differentiation is not done properly during mitotic differentiation and leads to a genetic disorder.
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According to the Lyon hypothesis,a. one of the X chromosomes is converted to a Barr body insomatic cells of female mammals.b. one of the X chromosomes is converted to a Barr body in allcells of female mammals.c. both of the X chromosomes are converted to Barr bodies insomatic cells of female mammals.d. both of the X chromosomes are converted to Barr bodies inall cells of female mammals.
Which of the following statements regarding the Y chromosome in mammals is TRUE?A. The Y chromosome is less than half the size of the X chromosome.B.Y chromosomes are most often present in egg cells and are not found in sperm cells.
C.Most female mammals have one Y chromosome.
D. The Y chromosome contains no protein-coding genes.
Which of the following statements is FALSE about x chromosome inavtivation in mammals?
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Chapter 8 Solutions
Genetics: Analysis and Principles
Ch. 8.1 - 1. A chromosome that is metacentric has its...Ch. 8.1 - Staining eukaryotic chromosomes is useful because...Ch. 8.2 - Prob. 1COMQCh. 8.3 - Which of the following statements is correct? a....Ch. 8.3 - Prob. 2COMQCh. 8.4 - 1. A paracentric inversion
a. includes the...Ch. 8.4 - Due to crossing over within an inversion loop, a...Ch. 8.4 - 3. A mechanism that may cause a translocation is...Ch. 8.5 - 1. Humans have 23 chromosomes per set. A person...Ch. 8.6 - Prob. 1COMQ
Ch. 8.6 - Prob. 2COMQCh. 8.7 - The term endopolyploidy refers to the phenomenon...Ch. 8.7 - 2. In agriculture, an advantage of triploidy in...Ch. 8.8 - Prob. 1COMQCh. 8.8 - The somatic cells of an allotetraploid contain a....Ch. 8 - 1. Which changes in chromosome structure cause a...Ch. 8 - Prob. 2CONQCh. 8 - 3. How does a chromosomal duplication occur?
Ch. 8 - 4. What is a gene family? How are gene families...Ch. 8 - Prob. 5CONQCh. 8 - Two chromosomes have the following orders for...Ch. 8 - An inversion heterozygote has the following...Ch. 8 - Prob. 8CONQCh. 8 - Explain why inversions and reciprocal...Ch. 8 - 10. An individual has the following reciprocal...Ch. 8 - A phenotypically normal individual has the...Ch. 8 - 12. Two phenotypically normal parents produce a...Ch. 8 - With regard to the segregation of centromeres, why...Ch. 8 - Prob. 14CONQCh. 8 - Prob. 15CONQCh. 8 - 16. A phenotypically abnormal individual has a...Ch. 8 - 17. A diploid fruit fly has eight chromosomes. How...Ch. 8 - Prob. 18CONQCh. 8 - Prob. 19CONQCh. 8 - 20. Aneuploidy is typically detrimental, whereas...Ch. 8 - 21. Explain how aneuploidy, deletions, and...Ch. 8 - Prob. 22CONQCh. 8 - 23. A cytogeneticist has collected tissue samples...Ch. 8 - Prob. 24CONQCh. 8 - A zookeeper has collected a male and a female...Ch. 8 - Prob. 26CONQCh. 8 - 27. What is mosaicism? How is it produced?
Ch. 8 - 28. Explain how polytene chromosomes of Drosophila...Ch. 8 - 29. Describe some of the advantages of polyploid...Ch. 8 - 30. While conducting field studies on a chain of...Ch. 8 - Prob. 31CONQCh. 8 - Which of the following terms should not be used to...Ch. 8 - Prob. 33CONQCh. 8 - Prob. 34CONQCh. 8 - A triploid plant has 18 chromosomes (i.e., 6...Ch. 8 - Prob. 36CONQCh. 8 - Prob. 37CONQCh. 8 - 38. A woman who is heterozygous, Bb, has brown...Ch. 8 - 39. What is an allodiploid? What factor determines...Ch. 8 - Prob. 40CONQCh. 8 - 41. Table 8.1 shows that Turner syndrome occurs...Ch. 8 - 42. Male honeybees, which are haploid, produce...Ch. 8 - Prob. 1EQCh. 8 - Prob. 2EQCh. 8 - With regard to the analysis of chromosome...Ch. 8 - 4. Describe how colchicine can be used to alter...Ch. 8 - 5. Describe the steps you would take to produce a...Ch. 8 - Prob. 6EQCh. 8 - What are G bands? Discuss how G bands are useful...Ch. 8 - A female fruit fly has one normal X chromosome and...Ch. 8 - Prob. 2QSDCCh. 8 - Besides the ones mentioned in this textbook, look...Ch. 8 - Prob. 4QSDCCh. 8 - 5. Discuss the importance of gene families at the...
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- Molecular geneticists have performed experiments in which they altered the number of copies of the bicoid gene in flies, affecting the amount of Bicoid protein produced. a. What would be the effect on development of an increased number of copies of the bicoid gene? b. What would be the effect of a decreased number of copies of bicoid? Justify your answers.arrow_forwardWhich is NOT a way that deletions can cause abnormal phenotypes? A. Haploinsufficient genes can result because too much gene product is produced. B. Recessive mutations may be expressed if the wild-type allele is deleted, a phenomenon called pseudodominance. C. If the centromere is deleted, then the whole chromosome could be lost during cell division. D. All of the above 1 pointsarrow_forwardIn mice, the Sry gene is located on the Y chromosome very close to one of the pseudoautosomal regions that pairs with the X chromosome during male meiosis. Given this information, propose a model to explain the generation of unusual males who have two X chromosomes (with an Sry-containing piece of the Y chromosome attached to one X chromosome).arrow_forward
- In an organism’s genome, autosomes are a. the chromosomes that differ between the sexes. b. chromosomes that are involved in sex determination. c. only inherited from the mother (maternal inheritance). d. all of the chromosomes other than sex chromosomesarrow_forwardWhich of the following findings supports the fact that the presence of the Y-chromosome rather than the lack of a second X-chromosome determines the development of maleness in mammals? a. A human with an X0 genotype (Turner syndrome) is phenotypically female. b. A human with an XXY genotype (Klinefelter syndrome) is phenotypically male. c. A transgenic mouse with two X-chromosomes and the SRY gene from the Y-chromosome develops male sex organs. d. b and c, but not a e. a, b, and carrow_forwardYou 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 XXYarrow_forward
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- An error occurred during meiotic cell division, and a human egg has an extra copy of chromosome 21. That egg was fertilized by a normal sperm to create an embryo. This would lead to an individual A) who was tetraploid B) who would be normal in chromosomal number C) who had trisomy D) who was triploidarrow_forwardNondisjunction can happen in males and females. It has been found to correlate with advanced maternal age but not paternal age. Why is that? A. Because estrogen promotes non-disjunction. B. Because oogenesis has a prolonged prophase and is more prone to have errors with maternal age. C. Because more mutations can happen in females. D. All of the above.arrow_forwardTwo normal-looking fruit flies were crossed, and, in the progeny, there were 202 females and 98 males.a. What is unusual about this result?b. Provide a genetic explanation for this anomaly.c. Provide a test of your hypothesis.arrow_forward
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