n on zion stion estion jestion Question Question 10 Question 11 Question 12 Question 13 Question < Question 1 of 15 > Macmillan Learning Which description is the best definition of a stem cell? a type of blood cell that does not have a nucleus, mitochondria, or other organelles a type of lymphocyte made in the thymus that contributes an adaptive immune response a specialized cell that divides by meiosis to produce gametes in order to facilitate sexual reproduction an undifferentiated cell that can replicate itself indefinitely and differentiate into specialized cell types when appropriate
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This means that stem cells have the ability to develop into different types of cells in the body. Show more…
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(a) Consider a somatic cell taken from a sexually-reproducing organism: If this cell is resting or performing the normal functions of the cell, but not going through cell division, how many versions of each type of chromosome would it contain? (BOLD the correct answer) ONE or TWO or THREE or twenty-three or forty-six (6) Explain why sexually reproducing organisms have the number of chromosome copies you indicated in part a. (c) Consider a gamete taken from a sexually-reproducing organism. How many versions of each chromosome does it contain? (d) If you were to look inside the nucleus of a zygote, how many versions of each chromosome would it contain? Explain why zygotes have the number of chromosome copies you indicated in part a. Relate your answer to how zygotes are formed. (f) After a zygote is formed, it undergoes many cell divisions to eventually form an embryo: Are these cell divisions mitotic or meiotic? Explain your answer. What is the word to describe the different "versions of a chromosome that diploid cells contain? What does "S phase" stand for during the cell cycle?
Sri K.
Adi S.
1. A somatic (body) cell is undergoing mitosis. How many cells would you expect to see at the end of the process? a. 1 b. 2 c. 3 d. 4 2. Gametogenesis is the process of producing sperm and eggs through meiosis. If a cell is undergoing division to produce sperm or egg cells, how many cells would you expect there to be at the end of the process? a. 1 b. 2 c. 3 d. 4 3. A parent cell (original cell) has 6 chromosomes. How many chromosomes would be present in a daughter cell formed by mitosis from this cell? a. 2 b. 3 c. 4 d. 12 4. Which one or more of the following events occurs in both interphase and interphase I? a. The membrane of the nucleus disappears. b. The DNA replicates. c. The chromosomes attach to the membrane of the nucleus. d. The fibers pull chromatids apart. e. Chromosomes condense. 5. Which of the following best describes a replicated chromosome? a. A pair of chromosomes that carry the same genes. b. A chromosome composed of two chromatids. c. A chromosome composed of a single chromatid. d. A chromosome composed of two genetically identical chromatids. e. Chromosomes composed of one chromatid from the mother and one chromatid from the father.
Josee P.
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