Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 42.2, Problem 2R
Summary Introduction
To review:
The effect of mutation in the mammal leading to loss of cytoplasmic bridges between the spermatids and the effect on the sex of the offspring produced by that mammal.
Introduction:
Sexual reproduction in animals involves the production and fusion of gametes from both males as well as female animals. The male gametes are called as sperms, whereas the female gametes are known as ovum or egg. The production and development processes of male and female gametes are different from each other.
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Check out a sample textbook solutionStudents have asked these similar questions
Why is parthenogenesis in bees considered to be a form of asexual reproduction?
Select one:
a. The male drone is made from a haploid egg. Fertilization is not part of the process to make a male drone.
b. The formation of the original haploid cell was achieved using binary fission.
c. Although genetic material is transferred from one cell to another using conjugation, the resulting cells will be identical to each other.
d. The haploid male bees were made through the process of meiosis, so they are identical to the parent egg cell.
Name two ways that genetic diversity is increased during meiosis.
meiosis in a cell with three pairs of homologous chromosomes produces eight unique gametes (crossovers aside). Use the same technique to determine how many unique gametes can be produced by a cell that has four pairs of homologous chromosomes.
A human female can release about 350 eggs during her reproductive years. What is the chance that she would generate the same gamete twice in her lifetime?
Chapter 42 Solutions
Life: The Science of Biology
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- If a human gamete with an extra chromosome participates in fertilization with a gamete with a normal number of chromosomes, how many chromosomes will the zygote have? Explain your answer. (Remember, zygotes are diploid)arrow_forwardA female Komodo dragon (Varanus komodoensis) kept in isolation in a zoo had offspring. Each of the offspring had two identical copies of every gene in its genome. However, the offspring were not identical to one another. Based on your understanding of parthenogenesis and meiosis, complete the hypothesis that explains these observations. Match the terms in the left column to the appropriate blanks in the sentences on the right. Not all terms will be used. Reset Help removed We can assume that normal gametes, which each other due to ,are are similar to formed. Then the genetic material is but doesn't occur. Thus a cell is formed, which develops into a new organism. haploid diffet from fertalizgtan duplicated feltalization meiotic recombination mitosis modified ate Copies of diploidarrow_forwardIn human spermatogenesis, mitosis of a stem cell gives rise to one cell that remains a stem cell and one cell that becomes a spermatogonium. Draw four rounds of mitosis for a stem cell and label; the daughter cells. For one spermatogonium, draw the cells it would produce from one round of mitosis followed by meiosis. Label the cells, and label mitosis and meiosis. What would happen if stem cells divided like spermatogonia?arrow_forward
- Describe how meiosis provides for genetic variability.If an animal had a haploid number of two (no sex chromosomes), how many genetically different gametes could it produce? (Assume no crossing over.) What if it had a haploid number of five?arrow_forwardUsing your knowledge of meiosis, explain why Drosophila progeny remain diploid? (2n=8)arrow_forwardGametogenesis in mammals is a complex process. When comparing spermatogenesis and oogenesis, indicated whether the follow statements are true or false. After the S phase, both the spermatogonial stem cell and primary oocyte have the same number of double-copy chromosomes. #analyze Question 1 options: True False Both the first polar body and the second polar body have the same number of chromosomes. #analyze Question 2 options: True False After the S phase, both the spermatogonial stem cell and primary oocyte have the same number of double-copy chromosomes. #analyze Question 3 options: True False Both the primary oocyte and the secondary spermatocyte have double-copy chromosomes. #analyze Question 4 options: True Falsearrow_forward
- imagine 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_forwardThe diagram in Figure 1 shows a section through the mammalian testis. With reference to this diagram answer the following questions: FIGURE 1 (a) What percentage of each of the following types of cells would you expect to contain an X chromosome. Give a REASON for your answer in each case. i) type cell A ii) type cell B (b)Name the cell type labelled B which under goes mitosis. State the importance of mitosis in a mature testis.arrow_forwardA sperm cell from the fruit fly Drosophila melanogaster contains four chromosomes. How many chromosomes would be present in a spermatogonial cell about to enter meiosis? How many chromatids would be present in a spermatogo- nial cell at metaphase I of meiosis? How many would be present at metaphase II?arrow_forward
- Describe the final cellular products produced when a primary oocyte undergoes meiosis (I and II) in human females. four haploid oocytes 1 diploid oocyte and 3 polar bodies 1 haploid oocyte and 2 polar bodies two genetically identical daughter cells four genetically identical daughter cellsarrow_forwardWhich 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.arrow_forwardIn humans, males are heterogametic and females are homogametic, Explain. Are there any examples where males are homogametic and females are heterogametic? Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.arrow_forward
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