Question

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explain all stages pf meiosis ?

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Answer 1

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♻Meiosis consists of two divisions, both of which follow the same stages as mitosis (prophase, metaphase, anaphase, telophase)

↪Meiosis is preceded by interphase, in which DNA is replicated to produce chromosomes consisting of two sister chromatids

A second growth phase called interkinesis may occur between meiosis I and II, however no DNA replication occurs in this stage

☸Meiosis I

➡The first meiotic division is a reduction division (diploid → haploid) in which homologous chromosomes are separated

➡P-I: Chromosomes condense, nuclear membrane dissolves, homologous chromosomes form bivalents, crossing over occurs

➡M-I: Spindle fibres from opposing centrosomes connect to bivalents (at centromeres) and align them along the middle of the cell

➡A-I: Spindle fibres contract and split the bivalent, homologous chromosomes move to opposite poles of the cell

➡T-I: Chromosomes decondense, nuclear membrane may reform, cell divides (cytokinesis) to form two haploid daughter cells

↔Meiosis II

➡The second division separates sister chromatids (these chromatids may not be identical due to crossing over in prophase I)

➡P-II: Chromosomes condense, nuclear membrane dissolves, centrosomes move to opposite poles (perpendicular to before)

➡M-II: Spindle fibres from opposing centrosomes attach to chromosomes (at centromere) and align them along the cell equator

➡A-II: Spindle fibres contract and separate the sister chromatids, chromatids (now called chromosomes) move to opposite poles

➡T-II: Chromosomes decondense, nuclear membrane reforms, cells divide (cytokinesis) to form four haploid daughter cells

➡The final outcome of meiosis is the production of four haploid daughter cells

↪These cells may all be genetically distinct if crossing over occurs in prophase I (causes recombination of sister chromatids)

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Answer 2

Answer:

Explanation:

Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.