What is the number of chromosomes in human cells during the following stages,respectively: Anaphase and Anaphase-$I$?

$X$-bodies were discovered by:

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

Which chromosome may be lost during cell division?

Which of the following is mismatched?

Identify the incorrect statements:
$(1)$ Meiosis involves only a single cycle of $DNA$ replication.
$(2)$ At the end of Meiosis-$I$,four haploid cells are formed.
$(3)$ Mitosis is generally restricted to diploid cells.
$(4)$ In yeast,the cell cycle takes approximately $90$ minutes to complete.