Q.

Arrange the sequence of meiosis in correct order.

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a

Crossing overSeparation of homologous chromosomesBivalent chromosomes align on the equatorial plateFormation of dyad of cells

b

Crossing overBivalent chromosomes align on the equatorial plateSeparation of homologous chromosomesFormation of dyad of cells

c

Crossing overBivalent chromosomes align on the equatorial plateFormation of dyad of cellsSeparation of homologous chromosomes

d

Bivalent chromosomes align on the equatorial plateSeparation of homologous chromosomesCrossing overFormation of dyad of cells

answer is B.

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Detailed Solution

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Correct sequence of events occurring during meiosis I is:

Crossing overBivalent chromosomes align on the equatorial plateSeparation of homologous chromosomesFormation of dyad of cells.

Crossing over occurs during pachytene stage of meiosis-I. During metaphase I bivalent chromosomes align on the equatorial plate. During anaphase I separation of homologous chromosome takes place. During telophase I the nuclear membrane and nucleolus reappear, cytokinesis follows and this is called as dyad of cells.

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