Q. 44.7( 3 Votes )

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)

Answer :

(a) False

When we grow from childhood to adulthood, the skin cell continuously multiply not only to replace lost one but also to produce more cells so that growth can occur.

(b) True

The gametes (sperm and eggs) are produced as a result of meiosis hence they have a haploid number of chromosomes.

(c) False
Nuclear membrane disappear in prophase stage, however, it reappears in telophase stage.

(d) True
Mitotic cell division can be a mode of reproduction in some unicellular organisms like yeast or amoeba which divides into two daughter cells.

(e) True

Crossing over is an exchange of chromatid segments between the two chromosomes of a homologous pair.

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