Question

all these questions have more than one correct answers

1) Meiosis & mitosis have similarities as well as differences. Which of the following represent similarities?

a) Both increases genetic variation

b) Both change in chromosomes number in daughter cells

c) Both only occur in eukaryotes

D) DNA replication must occur prior to both

e) Both make use of a spindle to separate chromatids

2) Meiosis is a special form of cell division. Select any of the following that applies to it.

a) Daughter cells have ½ the # of chromosomes as the parent cells

b) Meiosis II is very similar to mitosis

c) It occurs in gametes

d) It occurs in somatic cells

e) It occurs in germline cells

3) Meiosis requires that two divisions occur because

a) One division halves the chromosome number

b) DNA must be replicated twice in meiosis

c) One division duplicates each chromosome

d) One division doubles the chromosomes number

e) One division separates sisters chromatids

4) In meiosis, a process called crossing over may occur and may cause

a) Formation of recombinant chromosomes between maternal and paternal homologs

b) Exchange of DNA segments between non-sister chromatids that are homologs

c) Exchange of DNA segments between sister chromatids

d) Exchange of DNA segments between any non-sister chromatids

5) Meiosis increases genetic variation. The variation(s) that is specific to sexual reproduction, is on account of

a) Mutations that increase variation in genes

b) Crossing over between homologs

c) Randomness as to which gametes fuse

d) Fertilization combining gametes from two individuals

e) Random assortment of chromosomes

Answer 1

1.

D) DNA replication must occur prior to both

e) Both make use of a spindle to separate chromatids

2.

a) Daughter cells have ½ the # of chromosomes as the parent cells

b) Meiosis II is very similar to mitosis

e) It occurs in germline cells

3.

a) One division halves the chromosome number

e) One division separates sisters chromatids

4.

a) Formation of recombinant chromosomes between maternal and paternal homologs

b) Exchange of DNA segments between non-sister chromatids that are homologs

5.

b) Crossing over between homologs

d) Fertilization combining gametes from two individuals

e) Random assortment of chromosomes

In eukaryotic body there are two kind of cell division happen, mitosis cell division and meiosis cell division. Mitosis happen in all kind of somatic cells but meiosis happen only in germline cells. Before both the cell division, one round of DNA replication happen and for the mitosis cell division one round of DNA replication followed by one round of cell division so the chromosome numbers are equal to the mother cell in two daughter cells but for the meiosis cell division, one round of DNA replication followed by two round of cell division so four daughter cells are generated containing half of the chromosomes of the mother cell each. Meiosis has two division phases namely Meiosis I and Meiosis II. In meiosis I the homologous chromosomes get separated and give rise to two daughter cells having half of the chromosome number of the mother cell (half division) and in the meiosis II the sister chromosomes gets separated where total four daughter cells are generated (equal division). Meiosis II is the equal division (chromosome number is same between the preceding cell and the daughter cells) , so people say that meiosis II is alike with mitosis. Meiosis cell division play a very crucial role for genetic variation. This is achieved by the recombination between the non-sister chromatid of the homologous chromosomes which is exchange of part of the DNA between the maternal chromosome and the paternal chromosome and by the independent assortment of the paternal, maternal and recombinant chromatids.