ESSENTIALS OF GENETICS MCC BUNDLE >BI<
9th Edition
ISBN: 9781323915370
Author: KLUG
Publisher: PEARSON
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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?
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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 MCC BUNDLE >BI<
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...
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- 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
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- 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
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