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Cell Cycle and Cell Division · Question 21

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
1

Regarding Meiosis, which of the statements is incorrect?

  1. There are two stages in Meiosis, Meiosis-I and II
  2. DNA replication occurs in S phase of Meiosis-II
  3. Pairing of homologous chromosomes and recombination occurs in Meiosis-I
  4. Four haploid cells are formed at the end of Meiosis-II

Answer

(2) DNA replication occurs in S phase of Meiosis-II

Solution

As per NCERT, meiosis involves two sequential cycles of nuclear and cell division, meiosis I and meiosis II, but only a single cycle of DNA replication.

Meiosis I is initiated after the parental chromosomes have replicated in the S phase of interphase. The stage between the two meiotic divisions (interkinesis) is short and is not followed by DNA replication.

∴ There is no S phase in meiosis II, so statement (2) is incorrect.

Pairing of homologous chromosomes and recombination occur in prophase I, and four haploid cells are formed at the end of meiosis II – both correct.

Answer: (2)

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2

Select the incorrect statement with reference to mitosis :

  1. All the chromosomes lie at the equator at metaphase
  2. Spindle fibres attach to centromere of chromosomes
  3. Chromosomes decondense at telophase
  4. Splitting of centromere occurs at anaphase
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3

Which stage of meiosis can last for months or years in the oocytes of some vertebrates?

  1. Diakinesis
  2. Leptotene
  3. Pachytene
  4. Diplotene
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4

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme

  1. Polymerase
  2. Phosphorylase
  3. Recombinase
  4. Transferase
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5

Identify the correct sequence of events during Prophase I of meiosis: Choose the correct answer from the options given below:

  1. A, C, D, E, B
  2. A, B, C, D, E
  3. B, C, D, E, A
  4. B, A, C, E, D
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6

Bivalent or Tetrad formation is a characteristic feature observed during

  1. Chiasmata in zygotene stage
  2. Synaptonemal complex in zygotene stage
  3. Chiasmata in Diplotene stage
  4. Synaptonemal complex in Pachytene stage
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7

With respect to metaphase, which of the following statements is incorrect?

  1. Chromosomes lie at the equator of the cell
  2. Complete disintegration of nuclear envelope takes place
  3. Chromosomes are highly condensed
  4. Metaphase chromosomes are made up of four sister chromatids held together by centromere
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8

Which of the following stages of meiosis involves division of centromere?

  1. Telophase II
  2. Metaphase I
  3. Metaphase II
  4. Anaphase II
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9

Match List-I with List-II. Choose the correct answer from the options given below.

  1. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
  2. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  3. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
  4. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
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10

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after S phase?

  1. 32
  2. 8
  3. 16
  4. 4
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11

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

  1. Pachytene
  2. Leptotene
  3. Zygotene
  4. Diakinesis
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