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STD 11 - 10. Cell cycle and cell division — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 10. Cell cycle and cell division1 Mark
MCQ
During meiosis $I$, the chromosomes start pairing at
  • ✓
    zygotene
  • B
    pachytene
  • C
    diplotene
  • D
    leptotene.
✓

Answer

Correct option: A.
zygotene
a
(a) : During zygotene or zygonema of meiotic prophase $I$ the chromosomes become shorter and thicker. The homologous chromosomes come to lie side­by­side in pairs. This pairing of homologous chromosomes is known as synapsis, or syndesis. A pair of homologous chromosomes lying together is called a bivalent.

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