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 1R
Summary Introduction
To review:
The occurrence of crossing over phenomenon more frequently in human female oocytes than in male spermatocytes.
Introduction:
Meiosis is a kind of division in which reduction in a number of chromosomes occurs due to the nondisjunction of the chromatids during anaphase I of meiosis I. The event of crossing over is an important aspect of this division where the chromosome fragment is exchanged between the nonsister chromatids of homologous chromosomes. Meiosis mainly occurs in germ cells of the organisms so as to produce the gametes for sexual reproduction.
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A 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?
How many chromosomes would an oocyte contain if during anaphase II, the chromatids of one chromosome did not separate?
During spermatogenesis, which of the following options describes when cytokinesis would occur?
Following anaphase I
Following metaphase II
Following telophase I
Following telophase II
Chapter 42 Solutions
Life: The Science of Biology
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- If a cell with 24 chromosome pairs underwent meiosis, how many total chromatids would be in each gamete? What are three (3) differences between mitosis and meiosis?arrow_forwardIn human life did how many chromatids does a secondary oocyte carry? 22/23/44/46 or 92arrow_forwardHow many chromosomesdoes a human normal haploidcell have? How many chromosomes does a human normal diploid cell have? How many are the sexchromosomes within each ofthem?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_forwardHuman haploid gametes (sperm and eggs) contain: a. 46 chromosomes, 46 chromatids b. 46 chromosomes, 23 chromatids c. 23 chromosomes, 46 chromatids d. 23 chromosomes, 23 chromatidsarrow_forwardDuring which phases of the mitotic cycle would the terms chromosome and chromatid refer to identical structures?arrow_forward
- How many chromosomes does a human normal haploid cell have? How many chromosomes does a human normal diploid cell have? How many are thesex chromosomes within each of them?arrow_forwardWhat is unusual about the cytoplasm during cell divisions that result in spermatids?arrow_forwardwhy must sexually reproducing organisms use both processes of mitosis and meiosis, while asexually reproducing organisms only use mitosis?arrow_forward
- Male honeybees, which are haploid, produce sperm by meiosis.Explain what unusual event (compared with other animals) mustoccur during spermatogenesis in honeybees to produce sperm.Does this unusual event occur during meiosis I or meiosis II?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_forwardIf one follows 50 primary oocytes in an animal through theirvarious stages of oogenesis, how many secondary oocytes wouldbe formed? How many first polar bodies would be formed? Howmany ootids would be formed? If one follows 50 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would beformed? How many spermatids would be formed?arrow_forward
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