Select an incorrect statement with reference to cell cycle.

Duplication of genes occurs twice in meiosis

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Karyokinesis occurs twice during meiotic division

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Cyclins are proteins that activate protein kinases to regulate the cell cycle

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After telophase-I, chromosome number is reduced to half

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Solution

The correct option is A Duplication of genes occurs twice in meiosis
The gene or DNA does not get duplicated twice during meiosis. Duplication of chromosomes takes place during the S phase of the interphase. This duplication takes place only once before the begining of meiosis I. Before meiosis II, there is no duplication of chromosomes that takes place. Hence, DNA duplicates only once during meiosis.

Karyokinesis or the division of the nucleus takes place twice during meiosis.

Cyclin proteins activate the kinase proteins during the cell cycle.

At the end of meiosis, the daughter cells have half the number of chromosomes. So, meiosis is also called reductional division.

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Similar questions

Q. Identify the wrong statement about meiosis
1. Pairing of homologous chromosomes.
2. Four haploid cells are formed.
3. The number of chromosomes is reduced to half.
4. Two cycles of DNA replication occurs.

Q. Select the correct option:

Read the following statements.
(i) In mitotic cell division chromosome number is halved.
(ii) Kinetochore is the point where two sister chromatids are held together.
(iii) The period between two successive mitotic divisions is known as telophase.
(iv) In

G_{1}

phase of cell cycle protein and RNA are synthesised.
Which of the above given statements are correct?

The process of duplication of chromosomes is observed in interphase (or early prophase). The particular stage of the eukaryotic cell cycle during which this occurs is termed the -

Question 9
Identify the wrong statement about meiosis
(a) Pairing of homologous chromosomes
(b) Four haploid cells are formed
(c) At the end of meiosis the number of chromosomes are reduced to half
(d) Two cycle of DNA replication occurs

Q. Match the following events that occur in their respective phases of cell cycle and select the correct option:

Column - I	Column - II
(a)	$G_{1}$ phase	(i)	Cell grows and organelle duplication
(b)	S phase	(ii)	DNA replication and chromosome duplication
(c)	$G_{2}$ phase	(iii)	Cytoplasmic growth
(d)	Metaphase in M-phase	(iv)	Alignment of M-phase chromosomes

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