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Meiosis I


The first of the two consecutive divisions of the nucleus of eukaryotic cell during meiosis, and composed of the following stages: prophase I, metaphase I, anaphase I, and telophase I.


Briefly, the process starts when the chromosomes condense along the center of the nucleus (prophase I), and pair with their homologues during crossing over (metaphase I). Next, the pairs of chromosomes separate and move to opposite ends of the cell (anaphase I). The cell divides for the first time producing two cells (telophase I). The two cells will undergo meiosis II wherein both of them divide further into two cells.

Also called: first meiotic division

Compare: meiosis II
See also: meiosis

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... are possible in daughter cells following mitosis? b. What combination(s) of chromosomes are possible in haploid cells following both divisions of meiosis? (Hint: remember independent assortment)

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by lachatausa
Fri Mar 21, 2014 2:55 am
Forum: Genetics
Topic: genetic
Replies: 0
Views: 36

Meiosis prophase I crossover

“Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes.” http://en.wikipedia.org/wiki/Chromosomal_crossover Question: Due to the multiple layers of winding, how can parts of the chromosome break evenly? Is ...

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by gs99
Fri Mar 07, 2014 9:23 pm
Forum: Molecular Biology
Topic: Meiosis prophase I crossover
Replies: 0
Views: 76

Why can't sperm cells divide mitotically?

Hi,,, Can sperm cells or egg cells undergo mitotic division? I mean can a cell divide mitotically after meiosis? If not, why??? :roll: Thank you

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by Sue4
Sun Mar 02, 2014 10:07 am
Forum: Cell Biology
Topic: Why can't sperm cells divide mitotically?
Replies: 1
Views: 119

Re: Multicellular prokaryote

... differentiation, and importantly: endocystosis which allowed for the 'taking in' of other organisms. Sexual reproduction (especially meiosis) yielded new organisms which were both distinct but also compatible, arising from a single new cell. Essentially, eukaryotic organisms can be ...

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by thirdprometheus
Fri Nov 15, 2013 7:45 pm
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17568

Need an help about Drosophila genetics

... ; 3rd chromosomes wild-type homozygous crossed with: 2nd chromosomes wild-type homozygous; 3rd Chromosomes Repo and TM6 Using your knowledge of meiosis, what should you be looking for?

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by golgicik
Wed Oct 30, 2013 8:46 pm
Forum: Genetics
Topic: Need an help about Drosophila genetics
Replies: 5
Views: 1322
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