Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 50, Problem 3TYK
Summary Introduction
Introduction:
The fertilization of egg cells by sperm cells results in the formation of a zygote. This zygote develops into a complete organism by undergoing various developmental processes. These processes are mainly controlled by genes. Under some circumstances, these processes can be affected by environmental conditions.
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The number of chromosomes present in eurkaryotic cells
a. is consistent during the life cycle
b. is haploid among sexually reproducing forms and diploid if the reproduce sexually
c. is double by fertilization and cut in half by meiosis
d. is dependent on the age of the tissue
Which of the following mechanisms contributes to genetic variation through sexual reproduction via the random orientation of pairs of homologous chromosomes at metaphase of meiosis I?
A.
crossing over
B.
random fertilization
C.
independent assortment of chromosomes
D.
cytokinesis
The haploid genome of Toxoplasma gondii has 14 chromosomes. When an oocyst changes into a sporozoite, its nucleus contains
Select one:
a. 7 chromosomes
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d. 14 chromosomes
Chapter 50 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 50.1 - Prob. 1SBCh. 50.1 - Prob. 2SBCh. 50.2 - Prob. 1SBCh. 50.2 - Prob. 2SBCh. 50.2 - Prob. 3SBCh. 50.3 - Prob. 1SBCh. 50.3 - Prob. 2SBCh. 50.4 - Prob. 1SBCh. 50.4 - Prob. 2SBCh. 50.5 - Prob. 1SB
Ch. 50.5 - Prob. 2SBCh. 50.5 - Prob. 3SBCh. 50 - Prob. 1TYKCh. 50 - Prob. 2TYKCh. 50 - Prob. 3TYKCh. 50 - Prob. 4TYKCh. 50 - Prob. 5TYKCh. 50 - Prob. 6TYKCh. 50 - Prob. 7TYKCh. 50 - In the development of the female sex organs: a....Ch. 50 - In the embryonic development of the eye: a. the...Ch. 50 - Prob. 10TYKCh. 50 - Discuss Concepts Experimentally, it is possible to...Ch. 50 - Discuss Concepts Developmental biologist Lewis...Ch. 50 - Discuss Concepts Arguably, in sexually reproducing...Ch. 50 - Prob. 14TYKCh. 50 - Prob. 15TYKCh. 50 - Prob. 16TYKCh. 50 - Prob. 1ITDCh. 50 - Prob. 2ITDCh. 50 - Prob. 3ITDCh. 50 - Prob. 4ITD
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- Microscopic examination of a section of a normal young adult ovary reveals large numbers of unusually large cells surrounded by a single layer of flat epithelial cells. In which phase of the cell cycle are these cells arrested? A. Diplotene stage of the 1st meiotic division B. Diplotene stage of the 2nd meiotic division C. Metaphase stage of mitosis D. Prophase stage of mitosis E. Prophase stage of the 2nd meiotic divisionarrow_forwardMitosis occurs in which of the following situations? (select ALL that apply) A. Yeast cells reproducing asexually B. Certain plants that reproduce asexually C. Human adults who have stopped growing taller. D. The production of gamete cells E. Young multicellular organisms growing larger (normal growth) F. The development of a zygote after fertilization has occurred.arrow_forwardCells that result from meiosis are: a. Diploid b. Haploid c. Zygotic d. Triploidarrow_forward
- Which is NOT true for meiosis A. occurs in germ cells B. produces four daughter cells C. occurs in somatic cells D. requires two rounds of cell divisionarrow_forwardEgg and sperm cells are... A. Gametes B. Diploid C. Somatic cells D. Zygotesarrow_forwardWhich of the following events are required for a one-cell zygote to develop into an entire organism? 1. Genes need to be spatially and temporally expressed. 2. Telomerase needs to be active during embryogenesis. 3. The zygote needs to be totipotent. 4. Transcription factors need to bind to promoters. O A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correctarrow_forward
- Which of the following plays the greatest role in determining how cytoplasmic division occurs during cleavage? a. Number of chromosomes b. Amount of yolk c. Orientation of the vegetal pole d. Sex of the zygotearrow_forwardWhich of the following is true about Cleavage? Choose all possible answers a. At the end of cleavage, a 32-cell zygote called morula is formed. b. The angle and timing of mitotic spindle influence the pattern of embryonic cleavage. c. Cleavage is a series of mitosis that happens after the formation of zygote. d. The yolk protein is essential in determining where cleavage can occurarrow_forwardWhich of the following can occur by the process of meiosis but not mitosis? A. Haploid cells fuse to form diploid cells B. Diploid cells form haploid cells C. A diploid cell combines with a haploid cell D. Haploid cells multiply into more haploid cellsarrow_forward
- How 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_forwardwhich of the following events occurs during anaphase B in a mitotic cell a. lengthening of the overlap microtubules b. Shortening of the overlap microtubules c. Shortening of the overlap microtublues d. Shortening of the astral microtubules e. Lengthening of the kinetochore microtubulesarrow_forwardWhich of the following is UNTRUE with regards to human gametes and their production: A. Female gametes complete Meiosis II only after fertilization B. Polar bodies are the result of asymmetric cytokinesis C. Fetal oocytes are arrested in metaphase II D. Cells fated to become eggs and sperm undergo both mitosis and meiosis E. Meiosis in male yields 4 haploid productsarrow_forward
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