Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 15.3, Problem 2CC
Sexual Reproduction
Concept Check: What is the main purpose of meiosis in animals? What is the main purpose of mitosis in animals?
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- if a nucleus has 12 chromosomes when it begins meiosis, how may chromosomes dose it have after telophase I ? How many are there after telophase II?
- which meiotic phases underlie variation?
- why is it advantageous for a species to have variation with in genetic material? When is it a disadvantage?
BIO 1331: Organismal Biology, Meiosis In-Class Assignment
8. What is the ploidy of this cell, now?
Name:
Figure 3
9. What happened to the cell between Figure 2 and 3?
10. Do individuals that are homozygous at a given locus have different gamete
genotypes?
11. How many different types of gametes can an individual with the genotypes given
below produce? (Assume no crossing over). What are those gamete genotypes?
a. Aa: Example - this is one gene and the individual is heterozygous, so
they will make two types of gametes: "A" and "a"
b. AaBb
c. AaBbCC
d. AaBbCCDd
What are the possible offspring from a cross of the following two individual parents:
AABbCc x AABbCC; Make a punnett square for each gene individually (A, B & C)
"A"
"B"
"C"
12. List the possible genotypes of the offspring for the three genes (A, B and C)
combined:
2
10:10 E
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2. Why are chromosomes important?
3. How are meiosis I and meiosis II different?
1. What is the state of DNA at the end of meiosis I? What about at the end of meiosis II?
4. Why do you use non-sister chromatids to demonstrate crossing over?
7. Identify two ways that meiosis contributes to genetic recombination.
10. P
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5. What combination of alleles could result from a crossover between BD and bd chromosomes?
8. Why is it necessary to reduce the number of chromosomes in gametes?
6. How many nuclei are present at the end of meiosis II? How many chromosomes are in each?
a. Sperm Cell
b. Egg Cell
AP_5
c. Daughter Cell from Mitosis
ON 5G I
9. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would
expect to find in the following:
d. Daughter Cell from Meiosis II
COUS
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OeScience Labs, 2016
Chapter 15 Solutions
Biology
Ch. 15.1 - Researchers usually treat cells with drugs that...Ch. 15.1 - Which phases make up interphase?Ch. 15.1 - Prob. 1BCCh. 15.1 - Prob. 1EQCh. 15.1 - The Eukaryotic Cell Cycle CoreSKILL What...Ch. 15.1 - Prob. 3EQCh. 15.2 - Prob. 1CCCh. 15.2 - Prob. 2CCCh. 15.2 - Mitotic Cell Division Concept Check: What are the...Ch. 15.3 - Prob. 1CC
Ch. 15.3 - Sexual Reproduction Concept Check: What is the...Ch. 15.4 - Variation in Chromosome Structure and Number...Ch. 15 - Prob. 1TYCh. 15 - Prob. 2TYCh. 15 - Prob. 3TYCh. 15 - Prob. 4TYCh. 15 - Prob. 5TYCh. 15 - Which of the following is not an event of anaphase...Ch. 15 - Prob. 7TYCh. 15 - Which of the following statements accurately...Ch. 15 - Prob. 9TYCh. 15 - Aneuploidy may be the result of a. duplication of...Ch. 15 - Prob. 1CQCh. 15 - Prob. 2CQCh. 15 - Prob. 3CQCh. 15 - Prob. 1COQCh. 15 - A diploid eukaryotic cell has 10 chromosomes (5...
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- Activity 8: Sequencing Meiotic StagesLabel the stage of meiosis in each box below each diagram. Then, cut out each figure and arrange the cells so they reflect the proper order of stages of meiosis -starting with a cell in interphase and ending with the completion of meiosis. Write the letter sequence of the cells in your Lab, Activity #8.AMeiosis in animal cellarrow_forwardExercise Observe the diagram below and answer the following questions: Image Source: Wikimedia Commons 18₂1)-(²) (Cr)-(1 1. Which process is represented in these diagrams? Mitosis or meiosis? Explain your answer. 2. How many chromosomes did the cell start with? 3. How many chromosomes are present at the end of division I? 4. How many chromosomes are present in each cell at the end of division II? Homologous Chromosomes 5. Explain how meiosis results in UNIQUE cells. 6. Is this cell division occurring in a plant cell or an animal cell? What is the main difference between the two divisions?arrow_forwardPlease asaparrow_forward
- Picture 1 Picture 2 Picture 3 Picture 4 Picture 5 Picture 6 Meiosis stage descriptions 7. homologous pairs line up as tetrads along the middle of the cell 8. one of each homologous pair reaches the ends of the cell, the cell begins pinching in, and two new nuclear membranes form 9. DNA condenses in two haploid cells, the nuclear membranes disintegrate 10. sister chromatids split apart and daughter chromosomes move towards the ends of twn cellsarrow_forwardMeiosis stage descriptions 7. homologous pairs line up as tetrads along the middle of the cell 8. one of each homologous pair reaches the ends of the cell, the cell begins pinching in, and two new nuclear membranes form 9. DNA condenses in two haploid cells, the nuclear membranes disintegrate 10. sister chromatids split apart and daughter chromosomes move towards the ends of two cells 11. DNA replication has occured, DNA decondensed in one cell 12. four cells with half of the genetic material of a body cell result, all are different from each other Match the picture or the image with the name of the stage it represents. Use each stage just once for either an image or description.arrow_forward..explain why meiosis occurs only in specialized cells (gametes), and that the overall goal of meiosis is to make haploid cells for sexual reproduction • ..outline the sequence of key chromosomal movements and rearrangements during the two meiotic divisions, identifying key similarities and differences between meiosis and mitosis • ..describe the ploidy of a cell before and after meiosis I and meiosis II, and how ploidy changes after separation of sister chromatids and homologous chromosomesarrow_forward
- | The Role of Meiosis Key Idea: There are two types of cell division in eukaryotes, mitosis and meiosis, but only meiosis produces cells that are genetically different to the parent cell. New cells are formed when existing cells divide. There are two forms of cell division in eukaryotes, mitosis and meiosis. Mitosis produces two identical daughter cells from a parent cell. Meiosis is a special type of cell division, and produces sex cells (gametes or spores) for sexual reproduction. In sexual reproduction, sex cells from two parents combine to form an individual that is genetically different to its parents. The sex cells in humans, called eggs and sperm, are produced by meiosis. Events occurring during meiosis creates gametes with unique combinations of gene variants and so creates genetic variability. Sexual reproduction rearranges and reshuffles the genetic material into new combinations. This is why family members may look similar, but they'll never be identical (except for…arrow_forwardChapter 5: Mitosis and Meiosis BLM 5.1-2 A Diagrammatic Comparison of Mitosis and Meiosis Name: Draw chromosomes in the following cells to represent the various stages of mitosis and meiosis for an organism with a diploid number of 4. Label your diagrams with descriptions of the chromosomes and the key events that are occurring during this stage of the process.arrow_forwardN Question How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?arrow_forward
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