DEFINITIONS AND KEY POINTS OF REPRODUCTION IN CELL

TERMS   DEFINITIONS  
   
Phragmoplast Membranous vesicles are collected  in  the

centre. Membrane structure phragtnoplast is formed from vesicles.

Meiosis The special type of cell division in which the numbers of chromosomes in daughter cells are reduced to one half, as compared to the parent cells is called meiosis.
Homologous chromosomes The   similar  but  not   necessarily identical

chromosomesarecalled  ashomologous
chromosomes.

Bivalent         or


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tetrad

Each paired (but not fused) complex structure is called as bivalent or tetrad.
Crossing over The exchange of segment of the non-sister chromatids of homologous chromosomes is called crossing over.
Cell cycle The period from the time a cell is produced until it completes mitosis is called cell cycle.

 

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