Q2 of 33 Page 18

"First meiotic division is the reduction division".

What does the word 'reduction' refer to in this statement?

In this statement, ‘reduction’ means the number of chromosomes is reduced to half. The gametes (sperm and eggs) are produced as a result of meiosis hence they have a haploid number of chromosomes.


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1

State the difference between

Aster and spindle fibers.

 1

State the difference between

Haploid and diploid

 3

"Gametes must be produced by meiosis for sexual reproduction". Why is it so?

 4

Mention whether the following statements are true (T) or false (F). Give reason in support of your answer.

(a) As you grow from childhood to adulthood, your skin cells divide only to replace such cells that are lost from the surface. (T/F)


(b) The unfertilized human egg has half the number of chromosomes of the body cells. (T/F)


(c) The nuclear membrane in a mitotically dividing cell remains intact up to the metaphase and disappears only in the telophase. (T/F)


(d) Mitotic cell division can be a mode of reproduction. (T/F)


(e) Crossing-over between chromatids can occur only between homologous chromosomes. (T/F)