Q. 185.0( 1 Vote )
Pick out the item which has sequential arrangement.
A. zygotene ->Leptotene ->Pachytene ->Diplotene ->Diakinesis
B. Diakinesis ->zygotene ->Leptotene ->Pachytene ->Diplotene
C. Leptotene ->zygotene ->Pachytene ->Diplotene ->Diakinesis
This is the sequence which is followed during the prophase I step of Meiosis I. For the division firstly condensation of chromosomes take place, then pairing of homologous chromosomes take place, after that crossing over, then terminalisation take place and finally disappearance of nuclear membrane and nucleolus takes place.
Since, above mentioned steps are followed by sequence (iii).
Therefore, correct answer is (iii).
It can be better understood with the following picture:
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Tamil Nadu Board - Science
Here are some statements about meiosis. State whether each of them is true or false:
i) It takes place in somatic cells.
ii) Meiosis is also called reduction division.
iii) The pairing of homologous chromosomes is called crossing over.
iv) Meiosis leads to variations which form the raw material for evolution.Tamil Nadu Board - Science
i) pairing of homologous chromosomes
iii) crossing over
iv) formation of spindle apparatus.Tamil Nadu Board - Science
The important event of meiosis is the crossing over. It occurs during ________ .Tamil Nadu Board - Science
Reduction division is the process by which gametes are produced. The cells in which reduction division take place are ____________ .Tamil Nadu Board - Science
Pick out the item which has sequential arrangement.Tamil Nadu Board - Science
In Meiosis-I, the pairing of homologous chromosomes take place during ___________ stage.Tamil Nadu Board - Science