Regarding Meiosis, which of the statement(s) is incorrect?
- There are two stages in Meiosis, Meiosis-I and II
- DNA replication occurs in S phase of Meiosis-II
- Pairing of homologous chromosomes and recombination occurs in Meiosis-I
- Four haploid cells are formed at the end of Meiosis-II
The Correct Option is B
Solution and Explanation
- Meiosis consists of two distinct divisions: Meiosis-I and Meiosis-II. This statement is correct.
- DNA replication occurs in the S phase, but it only happens once during the entire process of meiosis, prior to Meiosis-I. There is no DNA replication during the S phase of Meiosis-II. Thus, this statement is incorrect.
- Pairing of homologous chromosomes (synapsis) and recombination (crossing over) occur in Meiosis-I. This statement is correct.
- At the end of Meiosis-II, four haploid cells are indeed formed. Therefore, this statement is correct.
Top Questions on Meiosis
- Identify the CORRECT sequence of subphases given below in the prophase of Meiosis I.
Match the stages of prophase I given in Column-I with their features in Column-II and choose the correct options from the choices given below:
- In karyokinesis of meiosis - I, which of the following separates?
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
- The correct sequence of events in prophase I is
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Concepts Used:
Meiosis
Meiosis is a process in which a single cell, a diploid cell, undergoes division twice to produce four haploid daughter cells, and the cells produced are known as the sex cells or gametes (sperms in males and egg in females). It contains half of the original amount of genetic information. The haploids only have half the number of chromosomes of the parent cell.
Features of Meiosis:
- It results in the formation of four daughter cells in each cycle of cell division.
- The daughter cells are identical to the mother cell in shape and size but different in chromosome number.
- The daughter cells are haploid.
- Recombination and segregation take place in meiosis.
- The process occurs in the reproductive organs and results in the formation of gametes.
- The process is divided into two types-Meiosis-I reduces the chromosome number to half and is known as reductional division. Meiosis-II is just like the mitotic division.
Phases of Meiosis
Meiosis can be divided into nine stages. The process is usually divided into two parts. The first time a cell divides (meiosis I) and the second time it divides (meiosis II). The phases are as follows –
Meiosis 1 Stages
The different stages of meiosis 1 can be explained by the following phases :
- Prophase 1
- Metaphase 1
- Anaphase 1
- Telophase 1
Meiosis 2 Stages
The different stages of meiosis 1 can be explained by the following phases :
- Prophase 2
- Metaphase 2
- Anaphase 2
- Telophase 2