Genetics: Analysis and Principles
5th Edition
ISBN: 9780073525341
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 6.4, Problem 1COMQ
Summary Introduction
Introduction:
Genetic analyses of sac
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The stages of meiosis where independent assortment occurs and crossing over begins, respectively, are
Select one:
a. Metaphase I and prophase II
b. Metaphase II and prophase I
c. Metaphase I and prophase I
d. Metaphase I and II and prophase I and II
Shown below is a photomicrograph of Rhoeo tradescantia cell undergoing meiosis. Answer the following question for the photomicrograph:
a. Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge)
b. Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph)
c. Explain how these aberrations are formed
d. Will this result to sterile or fertile gametes? Explain.
Which of the following is a TRUE statement regarding the outcome of meiosis?
A.
In meiosis, one diploid cell (2n) can produce 2 haploid cells in males (1n).
B.
In meiosis, four haploid cells (1n) can produce 2 diploid cells (2n) in males.
C.
In meiosis, one diploid cell (2n) can produce up to 4 haploid cells (1n) in males.
D.
In meiosis, one diploid cell (2n) can produce 2 diploid cells (2n) in females.
Chapter 6 Solutions
Genetics: Analysis and Principles
Ch. 6.1 - 1. Genetic linkage occurs because
a. genes that...Ch. 6.1 - In the experiment by Bateson and Punnett, which of...Ch. 6.2 - Prob. 1COMQCh. 6.2 - Prob. 2COMQCh. 6.2 - 3. For a chi square analysis involving genes that...Ch. 6.3 - Answer the multiple-choice questions based on the...Ch. 6.3 - Answer the multiple-choice questions based on the...Ch. 6.3 - Prob. 3COMQCh. 6.4 - Prob. 1COMQCh. 6.4 - Prob. 2COMQ
Ch. 6.5 - 1. The process of mitotic recombination involves...Ch. 6 - 1. What is the difference in meaning between the...Ch. 6 - 2. When a chi square analysis is applied to solve...Ch. 6 - 3. What is mitotic recombination? A heterozygous...Ch. 6 - 4. Mitotic recombination can occasionally produce...Ch. 6 - 5. A crossover has occurred in the bivalent shown...Ch. 6 - A crossover has occurred in the bivalent shown...Ch. 6 - A diploid organism has a total of 14 chromosomes...Ch. 6 - If you try to throw a basketball into a basket,...Ch. 6 - 9. By conducting testcrosses, researchers have...Ch. 6 - In humans, a rare dominant disorder known as...Ch. 6 - 11. When true-breeding mice with brown fur and...Ch. 6 - Though we often think of genes in terms of the...Ch. 6 - 13. If the likelihood of a single crossover in a...Ch. 6 - 14. In most two-factor crosses involving linked...Ch. 6 - Researchers have discovered that some regions of...Ch. 6 - 16. Describe the unique features of ascomycetes...Ch. 6 - Prob. 17CONQCh. 6 - Explain the difference between an unordered versus...Ch. 6 - Figure 6.1 shows the first experimental results...Ch. 6 - Prob. 2EQCh. 6 - E3. The experiment of Figure 6.7 is not like a...Ch. 6 - Prob. 4EQCh. 6 - 3. Explain the rationale behind a testcross. Is it...Ch. 6 - 4. In your own words, explain why a testcross...Ch. 6 - Explain why the percentage of recombinant...Ch. 6 - 6. If two genes are more thanapart, how would you...Ch. 6 - 7. In Morgan’s three-factor crosses of Figure 6.3,...Ch. 6 - Two genes are located on the same chromosome and...Ch. 6 - 9. Two genes, designated A and B, are locatedfrom...Ch. 6 - 10. Two genes in tomatoes areapart; normal fruit...Ch. 6 - In the tomato, three genes are linked on the same...Ch. 6 - A trait in garden peas involves the curling of...Ch. 6 - Prob. 15EQCh. 6 - 14. In the garden pea, several different genes...Ch. 6 - A sex-influenced trait is dominant in males and...Ch. 6 - Three recessive traits in garden pea plants are as...Ch. 6 - In mice, a trait called snubnose is recessive to a...Ch. 6 - 18. In Drosophila, an allele causing vestigial...Ch. 6 - 19. Three autosomal genes are linked along the...Ch. 6 - 20. Let’s suppose that two different X-linked...Ch. 6 - Prob. 23EQCh. 6 - In mice, a dominant allele that causes a short...Ch. 6 - 2. In Chapter 3, we discussed the idea that the X...Ch. 6 - Mendel studied seven traits in pea plants, and the...
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- During which stage(s) of meiosis do you expect to find tetrads? Select one: a. Prophase I and prophase II b. Prophase I and metaphase I c. Prophase I only d. Prophase I, metaphase I, and anaphase Iarrow_forwardWhich of the following meiotic events by itself does NOT result in an abnormal set of genes in a gamete? a. Translocation b. Deletion c. Nondisjunction d. Recombination e. Inversionarrow_forwardShown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrograph: a. Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge) b. Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph) c. Explain how these aberrations are formed d. Will this result to sterile or fertile gametes? Explain.arrow_forward
- An individual can have an abnormal number of chromosomes as a result of nondisjunction. Identify the following example of nondisjunction that results in an abnormal number of chromosomes. A. Sister chromatids do not separate in meiosis II. B. Homologous chromosomes move apart appropriately during meiosis I. C. Mitosis occurs normally during embryonic development. D. Two normal gametes fuse during fertilization.arrow_forwardSeparation of homologous chromosomes during Meiosis I requires: Select one: a. Removing centromere cohesion b. Nondisjunction c. Separase If nondisjunction occurred during Meiosis II: Select one: a. We assume all other meiotic events occurred normally b. All four gametes will be abnormal c. There is a higher risk that a second nondisjunction event occurredarrow_forward1)Discusses why Meiosis I is referred to as reduction division and why Meiosis II is essentially like Mitosis. 2)Discusses where problems are likely to occur in Meiosis and what these problems could lead to.arrow_forward
- When does crossing over usually occur, and what is the endresult?a. It occurs during prophase of meiosis I, and the end result isthe exchange of pieces between homologouschromosomes.b. It occurs during prometaphase of meiosis I, and the endresult is the exchange of pieces between homologouschromosomes.c. It occurs during prophase of meiosis I, and the end result isthe separation of sister chromatids.d. It occurs during prometaphase of meiosis I, and the endresult is the separation of sister chromatids.arrow_forwarda. What phase of Meiosis II is the cell in? How do you know? b. Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c. Draw the same cell during the same phase of Meiosis I. Label the elements.arrow_forwardHow would each of the following events affect the outcome of mitosis or meiosis? a. Mitotic cohesin fails to form early in mitosis. b. Shugoshin is absent during meiosis. c. Shugoshin does not break down after anaphase I of meiosis. d. Separase is defective.arrow_forward
- Consider a diploid cell that has 2n = 4 chromosomes: one pair of metacentric chromosomes and one pair of acrocentric chromosomes. Suppose that this cell undergoes nondisjunction, giving rise to an autotriploid cell (3n). The triploid cell then undergoes meiosis. Draw the different types of gametes that could result from meiosis in the triploid cell, showing the chromosomes present in each type. To distinguish between the different metacentric and acrocentric chromosomes, use a different color to draw each metacentric chromosome; similarly, use a different color to draw each acrocentric chromosome.arrow_forwardWhat is the designation for a gamete with one copy of each homologous chromosome? Select one: a. 3n b. 46 chromosomes c. n d. 2narrow_forwardWhich of the following statements are True? There may be more than one answer. Select one or more: a. Mitosis results in 2 haploid cells O b. If a parent cell with 10 chromosomes undergoes mitosis, each offspring cell will have 10 chromosomes O c. At the start of meiosis, a human cell will have 46 chromosomes and 92 chromatids d. The purpose of mitosis is the production of gametes e. In Meiosis, crossing over occurs during Meiosis II f. Meiosis only occurs in the testes and ovariesarrow_forward
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