Question

A Which of the following does NOT occur during mitosis? 

condensation of the chromosomes 

replication of the DNA 

spindle formation 

separation of sister chromatids

B. Which of the following statements regarding the function of mitosis is false? 

Mitosis promotes genetic diversity. 

Mitosis is necessary for asexual reproduction in eukaryotes. 

Mitosis promotes repair tissues. 

Mitosis allows organisms to grow.

C. At the end of which phase of cell division are the daughter cells half the ploidy (n) of the original parent cell (2n)? 

after Mitosis 

after Mitosis and MeiosisⅠ

after MeiosisⅠ

after Meiosis II

Answer 1

9. A. The correct answer is option b- replication of the DNA

Explanation: During mitosis, DNA replication do not occur. It occurs before mitosis at the S phase of interphase. Mitosis divides newly replicated DNA into two daughter cells.

9.B Correct answer is option a- Mitosis promotes genetic diversity - this is false statement

Explanation: In mitosis no crossing over occurs. So it does not produce any genetic diversity. In meiosis, crossing over occurs and the result is genetic diversity.

9.C Correct answer is option c - After Meiosis -I

Explanation: Meiosis I is also called the reduction division in which the ploidy number became half of the original. In meiosis -I homologous chromosomes separate from each other. This is necessary for maintenance of ploidy level in all organisms. Meiosis produce gamete cells which contain half of the chromosome. The reduction of chromosome occur in meiosis -I whereas Meiosis -II, sister chromatids are separated from each other. and it is called equational division like mitosis. So correct answer is Meiosis-I which produce haploid cells (n) from diploid cells (2n).