Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 8.4, Problem 2COMQ
Due to crossing over within an inversion loop, a heterozygote with a pericentric inversion may produce gametes that carry
a. a deletion.
b. a duplication.
c. a translocation.
d. both a deletion and a duplication.
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In a karyotype of a man whose wife has had several miscarriages, it was discovered that he had onlv 45 chromosomes. However, he displayed no obvious phenotypic defects. Furthermore, one of the chromosomes of pair 15 was abnormally long. Which of the following terms best describes the condition of this man?
a. monosomy
b,. trisomy
c. tetrasomy
d. translocation carrier
e. edward syndorme
Altered chromosome structure can drastically affect an individual organism’s phenotype. However, some types of chromosomal rearrangements are more likely to be harmful than others. Categorize the following types of rearrangements from MOST LIKELY to be harmful to LEAST LIKELY to be harmful.
A. reciprocal translocation, deletion, translocation
B. deletion, translocation, inversion
C. inversion, translocation, reciprocal translocation
D. translocation, inversion, duplication
Which of the following types of chromosomal changes would youexpect to have phenotypic consequences? Explain your choices.A. Pericentric inversionB. Reciprocal translocationC. DeletionD. Unbalanced translocation
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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- Explain why inversions and reciprocal translocations do not usually cause a phenotypic effect. In a few cases, however, they do. Explain how.arrow_forwardAn individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R S T • U D E F R S T • U V W X a. Draw a picture of these chromosomes pairing in prophase I of meiosis. b. Draw the products of alternate, adjacent-1, and adjacent-2 segregations. c. Explain why the fertility of this individual is likely to be less than the fertility of an individual without a translocation.arrow_forwardAn initial crossover event will occur between A and B, as indicated in the corresponding image. After this initial event occurs, a second cross over event occurs (not illustrated) involving the products of the first crossover event. Given the chromosome organization below, which two chromatids of the bivalent were involved and between which genes did the second crossover event occur to produce the indicated chromosomes? a. A B c, A b c, a B C, and a b C b. A B C, A B C, a b c, and a b c (return to the original crossover depicted in the image, and then determine how the second crossover event produced this arrangementarrow_forward
- Which of the following scenarios below can create a gamete with a large deletion of a chromosome? Select all that apply. Group of answer choices a. Crossing over between homologous chromosomes with misaligned repetitive sequences b. Nondisjunction of homologous chromosomes during meiosis I c.Crossing over between homologous chromosomes within an inversion loop d. Independent assortment of a translocation chromosome and its homologs during meiosis e. Segregating a trisomic chromosome during meiosis Iarrow_forwardThe normal sequence of nine genes on a certainDrosophila chromosome is 123 • 456789, where the dotrepresents the centromere. Some fruit flies were foundto have aberrant chromosomes with the followingstructures:a. 123 • 476589 c. 1654 • 32789b. 123 • 46789 d. 123 • 4566789Name each type of chromosomal rearrangement, anddraw diagrams to show how each would synapse withthe normal chromosome.arrow_forwardIndicate which of the four major classes of rearrangements (deletion, duplication, inversions, and translocations) are most likely to be associated with each of the following phenomena. In each case, explain the effect. a. Semisterility b. Lethality c. Vulnerability to mutation d. Haploinsufficiency e. Hypermorphic mutation (a gain of function mutation that causes an increase in otherwise normal gene function) f. Crossover suppression g. Aneuploidyarrow_forward
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