Medical
Biology
Interphase
Question
Short / Long Answer Type Questions :
Draw and explain a series of diagrams that illustrate the stages of meiosis I.
Draw and explain a series of diagrams that illustrate the stages of meiosis I.
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Solution
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At the onset of meiosis, DNA strands thicken into chromosomes.
Homologous, or like chromosomes begin to approach each other.
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Homologous chromosomes pair to from bivalents.
The centrioles divide and move to opposite poles of the cell.
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The bivalents duplicates to from tetrads, or four-chromatid groups.
The nuclear membrane disntegrates.
Crossing over (recombination) occurs.
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In metaphase I, the tetrads, attached to spindle fibers at their centromere, line up at mid-cell.
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In early anaphase I, the tetrads separate, and the paired chromatids move along the spindle to their respective centrioles.
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In late anaphase I, the chromatides have almost reached the spindle poles. The cell membrane begins to constrict.
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In telophase I, nuclear membrans enclose the sparated chromatids.
The cell membrane completes its constriction.
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The first meiotic division ends.
There are now two cells each with the same number of
chromatids as the parent cell.
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