ESSENTIALS OF GENETICS-MODIFIED ACCESS
9th Edition
ISBN: 9780134190006
Author: KLUG
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 2, Problem 2CS
CASE STUDY | Timing is everything
A man in his early 20s received chemotherapy and radiotherapy as treatment every 60 days for Hodgkin disease. After unsuccessful attempts to have children, he had his sperm examined at a fertility clinic, upon which multiple chromosomal irregularities were discovered. When examined within 5 days of a treatment, extra chromosomes were often present or one or more chromosomes were completely absent. However, such irregularities were not observed at day 38 or thereafter.
Do you think that exposure to chemotherapy and radiotherapy of a spermatogonium would cause more problems than exposure to a secondary spermatocyte?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
6. A 12 year old girl has mental retardation, ataxia, and a history of seizures. She does not speak but engages in frequent and excessive laughter. Cytogenetic analysis shows a deletion involving 15[del(15)(q11;q13). Genetic analysis in this patients family and in several other families with same syndrome shows that affected family members uniformly inherit the chromosome 15 with deletion from their mothers(rather than from their fathers). Tjis phenomenon is best explained by which of the following mechanisms?
(A) codominance
(B) Fragile sites
(C) Genomic imprinting
(D) Mitochondrial inheritance
(E) X-linked inheritance
1. A recently discovered bird species was found to have 29 chromosomes in its somatic cells before S phase.
a. How many chromosomes (2n) are present in a somatic cell during mitosis?
b. How many chromosomes does a bird receive from one parent?
c. How many sister chromatids are present during metaphase 2?
d. Assuming this species follows the same XX/XY sex differentiation as mammals, how many sex chromosomes are in an unfertilized egg?
e. How many pairs of homologous chromosomes would you expect to see lined up during metaphase 2?
2. An onion cell (2n) with 10 autosomes and 2 sex chromosomes is about to undergo meiosis. How many cells will result from this process, and what is the chromosome number and ploidy of each cell?
3. An animal is heterozygous for two autosomal genetic traits found on different chromosomes. Purple fur is inherited dominantly (with pp genotype giving green fur) and the gene is located near the telomere on the short arm of an acrocentric autosome. The gene for…
Background Info
Rainbow trout go through a unique genetic reproductive process. Female eggs are diploid, while male sperm are haploid. In the wild, when the sperm fertilizes an egg, the extra set of chromosomes is kicked out, resulting in a diploid offspring.Triploid trout are produced in the lab to provide sterile fish stock for lakes. Shortly after the eggs are fertilized, scientists place them in a warm water bath to prevent the extra chromosomes from being removed. The result is a triploid fish that cannot reproduce.Rainbow Trout: n = 30
Global warming is an issue affecting many species around the world. Warming has caused the temperatures in lakes and rivers to increase and stay elevated for longer periods of time.
Question
Select the FOUR numbers that describe the possible effects of global warming on the reproduction of rainbow trout in the wild and on biodiversity.
The extra set of chromosomes remains.
The extra set of chromosomes is removed.
The offspring are diploid (2n).…
Chapter 2 Solutions
ESSENTIALS OF GENETICS-MODIFIED ACCESS
Ch. 2 - CASE STUDY | Timing is everything A man in his...Ch. 2 - CASE STUDY | Timing is everything A man in his...Ch. 2 - CASE STUDY | Timing is everything A man in his...Ch. 2 -
HOW DO WE KNOW?
1. In this chapter, we focused...Ch. 2 -
2. Review the Chapter Concepts list on page 12....Ch. 2 - What role do the following cellular components...Ch. 2 -
4. Discuss the concepts of homologous...Ch. 2 - If two chromosomes of a species are the same...Ch. 2 - Describe the events that characterize each stage...Ch. 2 - How are chromosomes named on the basis of their...
Ch. 2 - Prob. 8PDQCh. 2 -
9. Describe the phases of the cell cycle and the...Ch. 2 - Define and discuss these terms: (a) synapsis, (b)...Ch. 2 - Prob. 11PDQCh. 2 - Prob. 12PDQCh. 2 - Contrast spermatogenesis and oogenesis. What is...Ch. 2 -
14. Explain why meiosis leads to significant...Ch. 2 -
15. A diploid cell contains three pairs of...Ch. 2 - Prob. 16PDQCh. 2 -
17. During oogenesis in an animal species with a...Ch. 2 - Prob. 18PDQCh. 2 -
19. During the first meiotic prophase, (a) when...Ch. 2 -
20. Describe the role of meiosis in the life...Ch. 2 - Prob. 21PDQCh. 2 - Prob. 22PDQCh. 2 - Prob. 23PDQCh. 2 -
24. If one follows 50 primary oocytes in an...Ch. 2 -
25. The nuclear DNA content of a single sperm...Ch. 2 - For Problems 26–31, consider a diploid cell that...Ch. 2 - For Problems 26–31, consider a diploid cell that...Ch. 2 - For Problems 26–31, consider a diploid cell that...Ch. 2 -
For Problems 26–31, consider a diploid cell that...Ch. 2 - For Problems 26–31, consider a diploid cell that...Ch. 2 - For Problems 26–31, consider a diploid cell that...
Knowledge Booster
Learn more about
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
- Discuss Concepts One of the human chromosome pairs carries a gene that influences eye color. In an individual human, one chromosome of this pair has an allele of this gene that contributes to the formation of blue eyes. The other chromosome of the pair has an allele that contributes to brown eye color (other genes also influence eye color in humans). After meiosis in the cells of this individual, what fraction of the nuclei will carry the allele that contributes to blue eyes? To brown eyes?arrow_forwardEqualizing 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?arrow_forwardHi, could your please answer this question? I'm so confused. The following diagram (picture added) shows 2 pairs of autosomal chromosomes in a karyotype of a biological woman. Based on the karyotype, a genetic counselor determined that there is evidence that a translocation occurred between two non-homologous chromosomes. The other 21 pairs of chromosomes are NOT shown in this diagram. Assume no chromosomal aberrations occurred in the other chromosomes. As a student-researcher, what would be your answer if the genetic counselor asks you if you can determine whether the translocation occurred in a somatic cell, germ-line cell, or whether this can even be determined from the figure? provide the reasoning for your answer.arrow_forward
- 1. Maurice was born with an XY chromosome type, and he has the external genitalia of a male. He has, for the better part of his life, however, felt like he was supposed to be a woman. He has always identified more with feminine clothes, behaviors, and emotions. According to chapter 10 in your textbook, Maurice has a male __________. 2. Maurice was born with an XY chromosome type, and he has the external genitalia of a male. He has, for the better part of his life, however, felt like he was supposed to be a woman. He has always identified more with feminine clothes, behaviors, and emotions. According to chapter 10 in your textbook, Maurice has a female __________. 3. __________ is a biological phenomenon, while __________ is a socially constructed phenomenon. 4. A young boy develops facial and chest hair, pubic hair, and an enlarged Adam’s apple. This happens because puberty is stimulating the development of his ______.arrow_forwardExplain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the fact that one of the extra X Chromosome is inactivated practically leaving an XY active sex chromosomes similar to a normal male?arrow_forwardpolygenic trait mating 2 An AaBBCcdd male mates with an AaBbCCDD female. 1. What is the maximum number of ridge-producing genes possible in one of the children? 2. What would be the TRC for this child if it is a male? 3. What is the minimum number of ridge-producing genes possible in a child of this couple? 4. If this child were a female, would she have a higher or lower TRC than the parent with the lower ridge count? A. lower B. higher C. equalarrow_forward
- 2. Healthy elephant somatic cells are 2n=56. How many chromosomes are in a daughter cell at the beginning of MEIOSIS II in elephants? Group of answer choices A. 28 un-replicated B. 28 replicated C. 56 un-replicated D. 56 replicated 3. While studying tumor cells, you notice that the histones of a particular chromosome have more acetyl groups bound to them in tumor cells, compared to the same chromosome in healthy cells. What would you expect for the amount of proteins encoded by genes on that chromosome in tumor cells compared to healthy cells? Group of answer choices A. Higher in tumor cells B. Lower in tumor cells C. Similar in tumor and healthy cellsarrow_forwardA company that offers PGD terms an embryo “normal and healthy” if it has 46 chromosomes. Why is this statement misleading? , Two famous male actors had twins using a surrogate mother who carried two embryos that hadbeen fertilized in vitro, one with one man’s sperm and the other with the other man’s sperm. In terms of genetics, how closely are the babies, a boy and a girl, related to each other if they have different fathers?arrow_forward1) What is Dosage compensation as it relates to sex chromosomes 2) What is the Lyon's Hypothesis--Who is Mary Lyon's 3) What is a Calico Cat? and How does one of these cats look and What has happened to their X chromosomes to make them look that way. IN YOUR OWN WORDS PLEASE NOT COPY PASTEarrow_forward
- 4) Explain why you can NOT typically have a Male Calico cat. 5) Can you think of any unusual situation where you might be able to have a Male Calico cat? Explain how this might occur 6) Explain how X chromosome inactivation takes place in mammals at the chromosomal and molecular level. B. What genes are involved in inactivating a human X chromosome? C. What role does X chromosome-specific inactivating transcript --XIST-- non coding RNA play in the inactivation of the human X chromosome.arrow_forwardX chromosome inactivation in a diploid XX female is not completely inactivated, explain?arrow_forwardAt the end of Meiosis II in human cells (specifically in males, for example), how many gametes are made from one original parent cell, how many chromosomes are in each gamete, and what is each chromosome made of (that is, if you compared, say, chromosome #1 in a gamete with the two #1 chromosomes the person inherited from his parents)?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Biology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781305073951Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningHuman Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Biology: The Unity and Diversity of Life (MindTap...
Biology
ISBN:9781305073951
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY