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
Answer :
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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Match the following:
In which sub-stages of meiosis-I do the following events occur?
i) pairing of homologous chromosomes
ii) terminalization
iii) crossing over
iv) formation of spindle apparatus.
Tamil Nadu Board - ScienceThe important event of meiosis is the crossing over. It occurs during ________ .
Tamil Nadu Board - ScienceReduction division is the process by which gametes are produced. The cells in which reduction division take place are ____________ .
Tamil Nadu Board - SciencePick out the item which has sequential arrangement.
Tamil Nadu Board - ScienceIn Meiosis-I, the pairing of homologous chromosomes take place during ___________ stage.
Tamil Nadu Board - Science