The stain used for cell division is :- .........

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
$(a)$ Nuclear membrane fails to disintegrate
$(b)$ Duplication of $DNA$ does not occur
$(c)$ Centromeres do not divide
$(d)$ Cytokinesis does not occur

Cell division occurs . . . . . . in plants and . . . . . . in animals.

As there occurs more and more condensation of chromatin during cell division,there occurs:

While examining the mitotic stage in a tissue,one finds some cells with $16$ chromosomes and some with $32$ chromosomes. What possible reasons could you assign to this difference in chromosome number? Do you think cells with $16$ chromosomes could have arisen from cells with $32$ chromosomes or vice versa?

Polytene chromosomes in salivary glands of Drosophila are formed as a result of