Can you please explain me about meiosis?
Asked by bojan narayanasamy rajaraajan
23rd October 2011,
12:00 AM
Answered by Expert
Answer:
Meiosis is a reduction division in which each germ cell divides to form four daughter cells, each with haploid chromosome complement. Meiosis results in the formation of gametes.
The process of meiosis essentially involves two cycles of division. These can be subdivided into four distinct phases which are a continuous process.
i) First meiotic Division : These includes 4 stages:
- Prophase I- Homologous chromosomes in the nucleus begin to pair up with one another and then split into chromatids (one half of a chromosome) where crossing over can occur.
- Metaphase I - Chromosomes line up at the equator of the cell,
- Anaphase I- The homologous chromosomes move to opposing poles from the equator
- Telophase I- A new nuclei forms near each pole alongside its new chromosome compliment.
At this stage two haploid cells have been created from the original diploid cell of the parent.
ii) Second Meiotic Division : This includes the following steps:
- Prophase II - The nuclear membrane disappears and the second meiotic division is initiated.
- Metaphase II - Pairs of chromatids line up at the equator
- Anaphase II - Each of these chromatid pairs move away from the equator to the poles via spindle fibres
- Telophase II - Four new haploid gametes are created that will fuse with the gametes of the opposite sex to create a zygote
Answered by Expert
24th October 2011,
1:14 AM
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