Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 6, Problem 2PDQ
Review the Chapter Concepts list on page 99. These all center on chromosome aberrations that create variations from the “normal” diploid genome. Write a short essay that discusses five altered
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Shown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs:
Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge).
Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph).
Explain how these aberrations are formed and relate to the possible causal mutation(s).
Will this result to sterile and/or fertile gametes? Explain.
Identify the type of chromosomal aberration described in each of the following cases and provide and example.
loss of a chromosome segment
extra copies of a chromosome segment
reversal in the order of a chromosome segment
movement of a chromosome segment to another, non homologous chromosome
A young couple is planning to have children. Knowing that there have been a substantial number of stillbirths, miscarriages, and fertility problems on the husband’s side of the family, they see a genetic counselor. A chromosome analysis reveals that, whereas the woman has a normal karyotype, the man possesses only 45 chromosomes and is a carrier of a Robertsonian translocation between chromosomes 22 and 13.
Q. What types of zygotes will develop when each of gametes produced by the man fuses with a normal gamete produced by the woman?
Chapter 6 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 6 - CASE STUDY| Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales
Aquatic vegetation...Ch. 6 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 6 -
CONCEPT QUESTION
2. Review the Chapter Concepts...Ch. 6 -
3. Define these pairs of terms, and distinguish...Ch. 6 -
4. For a species with a diploid number of 18,...Ch. 6 - What explanation has been proposed to explain why...Ch. 6 - Contrast the fertility of an allotetraploid with...Ch. 6 -
7. Why do human monosomies most often fail to...
Ch. 6 -
8. Describe the origin of cultivated American...Ch. 6 - Predict how the synaptic configurations of...Ch. 6 - Inversions are said to “suppress crossing over.”...Ch. 6 -
11. Predict the genetic composition of gametes...Ch. 6 - Human adult hemoglobin is a tetramer containing...Ch. 6 -
13. The primrose, Primula kewensis, has 36...Ch. 6 - Certain varieties of chrysanthemums contain 18,...Ch. 6 - Drosophila may be monosomic for chromosome 4, yet...Ch. 6 - Mendelian ratios are modified in crosses involving...Ch. 6 -
17. Having correctly established the F2 ratio in...Ch. 6 -
18. In a cross between two varieties of corn,...Ch. 6 -
19. A couple planning their family are aware that...Ch. 6 -
20. A woman who sought genetic counseling is...Ch. 6 - The woman in Problem 20 has had two miscarriages....Ch. 6 -
22. In a recent cytogenetic study on 1021 cases...Ch. 6 -
23. A boy with Klinefelter syndrome (47,XXY) is...Ch. 6 - In a human genetic study, a family with five...Ch. 6 - A 3-year-old child exhibited some early indication...Ch. 6 - A normal female is discovered with 45 chromosomes,...
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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
- A. Please explain the key differences between each of the following pairs of terms. (i) Haploid vs. monoploid (ii) Pericentric inversion vs. paracentric inversion (Please include a simple diagram, along with your written explanation.) (iii) Homologous chromosomes vs. homeologous chromosomes:arrow_forwardDiscuss the mechanisms that lead to erroneous chromosome duplication, mention how they effect the development of Down’s syndrome.arrow_forwardMatch the following: A duplicated chromosome is made of 2.A maternal and paternal chromosome present together, each with two sister chromatids 3.Semi-condensed DNA made up of coiled nucleosomes. 4.Super-coiled DNA strands. 5.Contains only one copy of each chromosome. 6.Name of an error during meiosis resulting in fewer chromosomes than normal in a zygote or individual (2n-1) 7.General term for an error resulting in the incorrect number of chromosomes in a gamete after meiosis 8.A specific version of a gene, such as blue eye colour 9.A region on a chromosome that codes for a protein 10.Region where chromosomes are attached 11.None of the above (should be selected more than once) with monosomy trisomy aneuploidy centromere gene sister chromatids diploid Haploid tetrad telomere Chromosomes Chromatin allelearrow_forward
- Explain the two major mechanisms by whichchromosomal rearrangements take place.arrow_forwardConsider and individual with 3 pairs of homologous chromosomes labeled as: A/a B/b D/d(where the slash line separates one chromosome from its homologues). How many differentmeiotic products (sperm or egg) can this individual produce? What are these?arrow_forwardWhich of the following statements is true regarding the phenotypic effects of inversions? Select ALL that apply. Heterozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because translocated and wild-type chromosomes do not separate correctly during meiosis II Homozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis I results in inviable gametes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis Il results in inviable gametesarrow_forward
- I. Give the chromosome number and chromosome configuration if the following mutations occurred in rice, a diploid organism wherein the number of chromosomes per set is 12. 1. Trisomy-11 2. Double Monosomy 3. Triploidy 4. Nullisomy-12 5. Tetraploid II. Give the chromosome number for the following: 6. 311+ 21 7. 4||+3||| 8. 2n=4 treated with colchicine to produce an autotetraploid 9. Monoploid maize (2n=20) 10, 51|^+ 51|Barrow_forwardAsaparrow_forwardwhat is the significance of chromosomal aberration? what are the different types of chromosomal abberations based on the structure and number of chromosomes? give examples for each. what environmental factors may increase in the incidence of chromosomal aberrations?arrow_forward
- A patient has abnormal expression of two genes at distant locations on the same chromosome. The genes normally lie in regions C and H shown below. What one chromosomal aberration could best explain this finding?arrow_forwardIdentify the type of chromosomal aberration described in each of the following cases: a. loss of a chromosome segment b. extra copies of a chromosome segment c. reversal in the order of a chromosome segment d. movement of a chromosome segment to another, nonhomologous chromosomearrow_forwardTheodor Boveri predicted that malignancies would often be associated with chromosomal mutation. What lines of evidence substantiate this prediction?arrow_forward
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