Explain the stages of mitosis and meiosis, justifying the behaviour of chromosomes at each stage. Please...

Explain the stages of mitosis and meiosis, justifying the behaviour of chromosomes at each stage.

Please answer this question 350 words

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Expert Solution

The stages of mitosis:

Prophase: The chromatin condensation occurs the chromatin turns in to chromosomes.

Metaphase : All chromosome line up along the equator of the cell and nuclear envelope dissoloves in this stage and it helps in the direct contact of microtubules with chromosomes.

Anaphase : During Anaphase the chromatid segragation occurs and the chromatids moves towards to poles.

Telophase : The chromosomes uncondences and forms chromatin. The nuclear membrane reforms.

The stages of meiosis: There is two stages in meiosis those are meiosis I and meiosis II

Meiosis I:

Prophase I: This prophase I includes five different stages.

Leptotene/leptonema - Lepto means thin and nema means thread. During this phase chromatin condensation occurs the chromatin turns in to think chromosomes

Zygotene/Zygonema - Zygo means mating and nema means thread. During this phase the holologous chormosome pairsup and formas tetrads.

Pachytene/Pachynema - Pachy menas thick and nema menas thread. During this phase the condensation occurs and forms thick chormosomes. During this phase the recombination occurs.

Diplotene - The chiasmata moves to wards the ends.

Diakinesis - nucleolus disappears, terminalization reaches to end, the chromosomes condenses and forms a thick and short chromosoems.

Metaphase I : All chromosome line up along the equator of the cell and nuclear envelope dissoloves in this stage and it helps in the direct contact of microtubules with chromosomes.

Anaphase I: During Anaphase the chromosome segragation occurs and the chromosomes moves towards to poles. Here due to chromosome segregation, the chromosome number reduces to half.

Telophase I: The chromosomes uncondences and The nuclear membrane reforms.

Meiosis II

Prophase II: The chromatin condensation occurs the chromatin turns in to chromosomes.

Metaphase II : All chromosome line up along the equator of the cell .

Anaphase II: During Anaphase the chromatid segragation occurs and the chromatids moves towards to poles.

Telophase II: The chromosomes uncondences and forms chromatin. The nuclear membrane reforms.

gladiator answered 1 year ago

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