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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Textbook Question
Chapter 5, Problem 3PDQ
As related to sex determination, what is meant by
(a) homomorphic and heteromorphic chromosomes; and
(b) isugamous and heterogamous organisms?
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A diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 7 chromosomes and two gametes are found to have 5 chromosomes.
A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred.
B) Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.
If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally.
a) Will any normal gametes result?
b) How many chromosomes will each human gametehave?
If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally.
a) Will any normal gametes result?
b) How many chromosomes will each human gamete have?
If the 2n chromosome number of an organism is 12:
(a) what is the probability of having a spermatid with equal number of maternal and paternal chromosomes? (b) of a polar body containing at least two paternal chromosomes.
Chapter 5 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 5 -
CASE STUDY | Doggone it!
A dog breeder...Ch. 5 - CASE STUDY| Doggone it! A dog breeder discovers...Ch. 5 - CASE STUDY| Doggone it! A dog breeder discovers...Ch. 5 -
CASE STUDY | Doggone it!
A dog breeder...Ch. 5 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 5 - Review the Chapter Concepts list on p. 84. These...Ch. 5 - As related to sex determination, what is meant by...Ch. 5 -
4. Contrast the life cycle of a plant such as...Ch. 5 - Prob. 5PDQCh. 5 -
6. Describe the major difference between sex...
Ch. 5 - How do mammals, including humans, solve the...Ch. 5 -
8. What specific observations (evidence) support...Ch. 5 - Describe how nondisjunction in human female...Ch. 5 -
10. An insect species is discovered in which the...Ch. 5 -
11. Given your answers to Problem 10, is it...Ch. 5 - When cows have twin calves of unlike sex...Ch. 5 -
13. An attached-X female fly, XXY (see the...Ch. 5 -
14. Assume that on rare occasions the attached X...Ch. 5 - It is believed that any male-determining genes...Ch. 5 -
16. What is a Barr body, and where is it found...Ch. 5 - Indicate the expected number of Barr bodies in...Ch. 5 - Define the Lyon hypothesis.Ch. 5 - Can the Lyon hypothesis be tested in a human...Ch. 5 - Predict the potential effect of the Lyon...Ch. 5 -
21. Cat breeders are aware that kittens...Ch. 5 -
22. What does the apparent need for dosage...Ch. 5 - In mice, the Sry gene (see Section 5.2) is located...Ch. 5 - The genes encoding the red- and...Ch. 5 - In mice, the X-linked dominant mutation Testicular...Ch. 5 -
26. Shown here are graphs that plot the...Ch. 5 -
27. In chickens, a key gene involved in sex...
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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
- If an non disjunction occurs in meiosis 2 in a male and the resulting sperm fertilizes a normal female egg, which of the following coujld result. Check ALL that apply a) YO b) XYY c) XXY d) XXX e) XO Polar bodies are formed during Male meiosis Female meiosis Both male and female meiosis Neither male nor female meiosis A brain cell in a normal human male would have a Y chromosome. a) True b) Falsearrow_forwardIn fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis? a)After the second meiotic division in males, and after the first meiotic division in females. b)After the second meiotic division in both males and females. c)After the first meiotic division in both males and females. d)After the first meiotic division in males, and after the second meiotic division in females.arrow_forwardimagine a giraffe whose diploid is 30. A)Under what circumstances would the giraffe go through a process of meiosis? . b) what will be the final result of this meiosis for the giraffe (# of cells + # of chromosomes/cells)arrow_forward
- Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?arrow_forwardWhich of the following is least likely to produce genetic variation in the offspring of an individual? (a) a DNA replication error caused by DNA polymerase in a body cell of the individual (b) a cross over event during meiosis that creates a new combination of alleles in the gametes (c) independent assortment of chromosomes during meiosis that creates a new combination of alleles in the gametes (d) the random fertilization of an egg cell by a sperm cell during sexual reproductionarrow_forwardWhat are the advantages and disadvantages of the alternation between fertilization and meiosis in sexually reproducing organism?arrow_forward
- If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have? If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have?arrow_forwardIdentify the sex of organism as male or female in which the sex chromosome are found as(i) ZW in bird (ii) XY in Drosophila (iii) ZZ in birds. (iv) XO in grasshopper.arrow_forward(d) With the random segregation of dyads, how many possible combinations are there at the end of meiosis for a diploid number of 10? (e) If half the chromosomes of a human primary oocyte segregate into the first polar body, which degenerates, why aren't some of the different kinds of chromosomes of the diploid chromosome complement absent from the egg? (f)What is the significance of the formation of polar bodies?arrow_forward
- (i)Draw a diagram of Metaphase I and II of meiosis in the father, which illustrates the only possible way in which the father’s chromosomes could have aligned during Metaphase I, and in the subsequent Metaphase II in the same cell, in order to have resulted in the conception of the specific son who has all three of these genetic conditions (achondroplasia, color blindness and deafness). (ii) Then, in the final set of diagrams, show the specific genes and chromosomes present in each of the four gametes that would have resulted from this series of events during meiosis I and II in the father. (iii) Indicate which gamete or gametes produced by the father could have been involved in the son’s conception, by labeling the gamete(s) with an ARROW.arrow_forwardDuring meiosis in male mammals, sex chromosomes segregate to produce two types of sperm: X‑bearing sperm and Y‑bearing sperm. True or false?arrow_forwardWhat are the non-random events that occur during sexual reproduction (post-meiosis) in humans? Please be specific on naming the events.arrow_forward
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