Cell Cycle and Cell Division

| 159

Notes

SÏGÑÏFÏÇÅÑÇË ØF MËÏØSÏS



It conserves the chromosome number of each species.



It causes genetic variation (due to crossing over) in the population of

organisms. It is important for evolution.

(AIPMT 1994)



Reorganisation of genetic material or genetic recombination occurs in

meiosis.



In meiosis, the haploid daughter cells differ from parents cell as well as

amongst themselves due to - independent assortment or crossing over

Amitosis

Brachymeiosis

ÅDDÏTÏØÑÅL PØÏÑTS

Amitosis is the cleavage of

nucleus without recognisable

chromosome distribution and

spindle formation.

Brachymeiosis is the process of

two reduction division and one

equational division.