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"Crossing -over" takes place in -
This question was previously asked in
RPSC 2nd Grade Science - 2015 Official Paper
Answer (Detailed Solution Below)
Option 1 : pachytene
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- Crossing over is the exchange of genetic material between two homologous chromosomes.
- It results in a mixture of parental characteristics in offspring and produces new individuals with new combinations of traits.
- It is also an enzyme mediated process.
- Recombinase enzyme is involved in crossing over.
- Crossing over takes place in pachytene stage of the meiotic prophase-I.
- Recombination nodules appear during the pachytene stage.
- It is the site of crossing over which occurs between the non-sister chromatids of the homologous chromosomes.
- Crossing over leads to the recombination of genetic materials on the chromosomes.
Hence, the correct option is (1) pachytene.
- It is the first stage of the meiotic prophase-I.
- During this stage chromosomes are gradually visible under light microscope.
- The compaction of chromosomes continues throughout the stage.
- In the beginning of this stage dissolution of synaptonemal complex takes place.
- The recombined homologous chromosomes of the bivalents start to separate from each other except at the sites of crossing over.
- It is the final stage of the meiotic prophase-I.
- During this stage, chromosomes are fully condensed and meiotic spindles are assembled to prepare the homologous chromosome to separate.
- By the end of this stage, nucleolus disappears and nuclear envelope breaks down.
Last updated on Jan 13, 2023
RPSC Senior Teacher Grade II Admit Card Out for Sanskrit Edu Dept. RPSC Senior Teacher Grade II Question Papers Out for Senior Teacher (Secondary Edu Dep.).The exam for Group C & D took place on 29th January 2023. Earlier, RPSC Senior Teacher Grade 2 exam dates were out for Sanskrit Education Department. The exam will be held from 12th to 16th February 2023. In the meantime, the candidates must go through the RPSC Senior Teacher Grade 2 Preparation Tips and give a boost to their preparation. Also note that separate cycles are going on for Sanskrit Education and Secondary Education Departments.