NTA Abhyas NEET2020BotanyCell Cycle and Cell DivisionPractice
Which of these statements is not true?
Options
- ACrossing over is the exchange of genetic material between two homologous chromosomes.
- BThe enzyme which is involved during crossing over is called recombinase.
- CRecombination between homologous chromosomes is completed by the end of diakinesis.
- DSynaptonemal complex is formed during zygotene.
Correct answer
C. Recombination between homologous chromosomes is completed by the end of diakinesis.
Step-by-step solution
The first two stages of prophase I are relatively short-lived compared to the next stage that is pachytene. During this stage bivalent chromosomes now clearly appears as tetrads. This stage is characterised by the appearance of recombination nodules, the sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes. Crossing over is the exchange of genetic material between two homologous chromosomes. Crossing over is also an enzyme-mediated process and the enzyme involved is called