Which of the following events characterizes metaphase of mitosis?

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1. which of the following events characterizes metaphase of
mitosis?

           1.
attachment of spindle fibers to the kinetochores of the
chromosomes

           2.
movement of chromosomes to the equatorial plane of the cell.

           3.
separation of sister chromatids that are being pulled to the poles
of the cell

A. 1

B. 2

C. 3

D. 1 and 2

E. All of these

2. One cell undergoes one round of meiosis. How many genetically
identical cells will be present at the end of this one round of
meiosis?

A. 2

B. 4

C. 8

D. 0

E. impossible to tell

3. The house fly, musca domestica, has a haploid chromosome
number of 6. How many chromatids should be present in a diploid,
somatic, metaphase cell?

A. 3

B. 6

C. 12

D. 18

E. 24

4. The following events are common to mitosis and meiosis except
for?

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A. DNA replication precedes cell division

B. Homologous chromosomes segregate

C. Sister chromatids segregate

D. DNA condenses during cell division

E. Cytokinesis occurs at the end of cell division

Answer

Q1. Option D. 1&2

During metaphase stage, all chromosomes arranged in a equatorial
plate according to their centromere position. At the same time
spindle fibres are attached to the kinetochore of centromere of
each chromosome.

Separation of sister chromatids is a characteristic feature of
anaphase.

So the right option is D

Q2. Option D. 0

Meiosis produces four daughter cells. All the daughter cells are
genetically different from one another because of recombination.
During pachytene stage of Prophase crossing over occurs to exchange
the genetic material between two non sister chromatids of
homologous chromosomes. This leads to the daughter cell become
genetically dissimilar.

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But in mitosis, formed daughter cells are genetically similar to
each other since there is no recombination occurs.

Q3. Option E

Single chromosome at its haploid stage has a single chromatid.
After a DNA replication new chromatid is formed called as sister
chromatid and both chromatids held together by a centromere. So at
its diploid stage, chromosome has two sister chromatids.

In Musca domestica haploid number of chromosomes is 6,
it means the number of chromatids present is also 6. In diploid
stage one more sister chromatid is added to each chromosome. So
each chromosome has two chromatids. In diploid condition chromosome
number is 12. Therefore total number of chromatids is 24.

Q4. Option B.

Both in mitosis and meiosis, DNA preceds cell division. Cell
division begins only after the completion of replication of DNA
occurs. During the formation of chromatids and chromosomes DNA is
get condensed. And chromosomes are arranged in an equatorial plate
and are get segregated. After this step cytokinesis occurs to form
new daughter cells.

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In meiosis, homologous chromosomes are get segregated but in
mitosis no segregation of homologous chromosomes occurs. In
meiosis, segregation of homologous chromosomes occurs at anaphase I
of meiosis I. And segregation of sister chromatids occurs at
anaphase II of Meiosis II.

In Mitosis, segregation of sister chromatids occurs at anaphase
without the segregation of homologous chromosomes.


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