MITOSIS/MEIOSIS REVIEW
2A cell that passes the restriction point will most likely undergo chromosome duplication.
4 If there are 12 chromosomes in an animal cell in G1 stage of the cell cycle, what is the diploid number of chromosomes for this organism? 12
6 How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle? The daughter cells have the same number of chromosomes and the same amount of DNA. C Cells that have stopped dividing and are differentiating are in the G1 phase of the cell cycle.
Answer the question(s) below that consist of five numbered headings concerned with the cell cycle. For each phrase or sentence, select the heading that is most closely related to it. Each heading may be used once, more than once, or not at all. 1. G0 2. G1 3. S 4. G2 5. M
8 Nerve and muscle cells are in this phase. 1
10 Chromosomes are duplicated during this phase 3
12 The formation of a cell plate is beginning across the middle of a cell and nuclei are reforming at opposite ends of the cell. What kind of a cell is this? a plant cell undergoing cytokinesis
Refer to the terms below to answer the following question(s). Each term may be used once, more than once, or not at all. 1. telophase 2. anaphase 3. interphase 4. metaphase 5. prophase
14 Centrioles begin to move apart in animal cells. 5
16 Centromeres uncouple, sister chromatids are separated, and each new chromosome moves to opposite poles of the cell. b
18 When is a chromatid a chromatid? A chromatid is a chromatid as long as it is held in association with a sister chromatid at the centromere.
20 A cell containing 92 chromatids at the start of mitosis would, at its completion, produce cells containing how many chromosomes?46
22 If there are 20 centromeres in a cell, how many chromosomes are there? 20
24 If there are twelve centromeres in a cell in G1 of the cell cycle, what is the diploid number of chromosomes? 12
26 All of the following occur during mitosis/ the coiling of chromosomes. /the division of centromeres. /the formation of a spindle. / the degradation of the nuclear envelope.
28 Suppose a plant cell had a mutation that prevented the Golgi apparatus from functioning. Which of the following processes would occur? /. cellular respiration /. photosynthesis / mitosis /. DNA replication
30 If the liver cells of an organism have 24 chromosomes, the sperm cells would have how many chromosomes? 12
32 Which of the following events occurs during prophase I of meiosis? synapsis and crossing over
34 At which stage of mitosis are chromosomes photographed in the preparation of a karyotype? metaphase
36 Which of the following occur in comparing prophase I of meiosis and prophase of mitosis? / The chromosomes condense in both. / The nuclear envelope disassembles in both. / A spindle forms in both./ Each chromosome has two chromatids.
They have half the number of chromosomes and half the amount of DNA.
38 What is a karyotype? a method of organizing the homologous chromosomes of a cell in relation to their number, size, and type
40 For a species with a haploid number of 23 chromosomes, how many different combinations of maternal and paternal chromosomes are possible for the gametes? more than 8 million
Use the key shown below to answer the following question(s). Each answer may be used once, more than once, or not at all.
1. If the statement is true for mitosis only
2. If the statement is true for meiosis I only
3. If the statement is true for meiosis II only
4. If the statement is true for mitosis and meiosis I
5. If the statement is true for mitosis and meiosis II
42 Homologous chromosomes synapse and crossing over occurs. 2
44 Independent assortment of chromosomes occurs.2
Match the key event of meiosis with the stages listed below, to answer the following question(s).
I. Prophase I VI. Prophase II
II. Metaphase I VII. Metaphase II
III. Anaphase I VIII. Anaphase II
IV. Telophase I IX. Telophase II
V. Interkinesis
46 Synapsis of homologous pairs occurs; crossing over may occur.I
48 Centromeres of sister chromatids uncouple and chromatids separateVII
50 This question refers to some essential steps in meiosis described below.
1. Formation of two new nuclei, each with half the chromosomes present in the parental nucleus 5
2. Tetrads align at the metaphase plat e2
3. Separation of sister chromatids 4
4. Separation of the homologs; no uncoupling of the centromere 3
5. Synapsis; chromosomes moving to the middle of the cell in pairs 1
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