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Meiotic division

meiotic division --> meiosis

A specialised form of nuclear division in which there two successive nuclear divisions (meiosis I and II) without any chromosome replication between them. Each division can be divided into 4 phases similar to those of mitosis pro, meta, ana and telophase). Meiosis reduces the starting number of 4n chromosomes in the parent cell to n in each of the 4 daughter cells. Each cell receives only one of each homologous chromosome pair, with the maternal and paternal chromosomes being distributed randomly between the cells. This is vital for the segregation of genes. During the prophase of meiosis I (classically divided into stages: leptotene, zygotene, pachytene, diplotene and diakinesis), homologous chromosomes pair to form bivalents, thus allowing crossing over, the physical exchange of chromatid segments. This results in the recombination of genes. Meiosis occurs during the formation of gametes in animals, which are thus haploid and fertilization gives a diploid egg. In plants meiosis leads to the formation of the spore by the sporophyte generation.


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unbalanced gender ratios of offspring

... is the exact reason for even sex rations, but reliance solely on the meiotic division sounds like a suspiciously simple answer, since nature would have surely found a means ...

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by biohazard
Tue Jun 18, 2013 11:51 am
 
Forum: Human Biology
Topic: unbalanced gender ratios of offspring
Replies: 6
Views: 4251

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... Mendels law of independent assortment and explain why it applies to meiotic cell division but NOT apply to mitotic cell division . I also have to refer to the diagram that ...

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by 1fh2
Tue Jan 29, 2013 1:23 am
 
Forum: Genetics
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some bio multiple choice questions

... be D? 3. The three nuclei in a mature pollen grain are formed by a. one meiotic division and one mitotic division. b. two meiotic divisions and one mitotic division. c. one ...

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by jjkwest1
Fri Feb 10, 2012 8:00 am
 
Forum: Botany Discussion
Topic: some bio multiple choice questions
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Polar Bodies

In meiotic division, why are polar bodies called polar bodies? Thanks for the help.

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by mjwilliams10
Sun Sep 18, 2011 7:39 pm
 
Forum: Human Biology
Topic: Polar Bodies
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mitotic/meiotic reproduction ratio?

... a normal human body, is it possible to estimate the number of mitotic divisions happening at some point of time? Is this mitotic cell division more frequent when compared to meiotic cell division?

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by deostroll
Fri May 20, 2011 7:56 pm
 
Forum: Cell Biology
Topic: mitotic/meiotic reproduction ratio?
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