Cell Cycle and Cell Division - Online Test
Q1. Chromosome appeared beaded during
Answer : Option A
Explaination / Solution:
Chromosome appeared beaded during leptotene stage of prophase of meiosis I due to the distinct appearance of nucleosomes. Chromatin materials start condensing after that stage.
Q2. Which stage is marked by terminalisation of chiasmata?
Answer : Option C
Explaination / Solution:
Chismata is formed due to crossing over. During diakinesis of prophase I of meiosis terminalisation of chiasmata takes place which indicates end of crossing over and separation of the non-sister chromatids.
Q3.
Which phase of meiosis in animal cell is shown in figure given below?
Answer : Option B
Explaination / Solution:
In diakinesis phase of prophase of meiosis I terminalisation of chismata takes place which is visualized in picture.
Q4. Crossing over results in exchange of genetic material, which occurs between
Answer : Option C
Explaination / Solution:
Crossing over is the exchange of genetic material between non-sister chromatids of two homologous chromosomes involved in the pairing process.
Q5. The sexual reproduction involves fusion of special type of cells called gametes, produced by
Answer : Option D
Explaination / Solution:
Meiosis cell division is involved in gametes formation as gametes contain half the number of chromosomes that a normal cell diploid cell contains. Gametes fuse to produce diploid zygote .
Q6. Small disc like structures that occur in the centromere are
Answer : Option A
Explaination / Solution:
Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres (formed by the spindle fibres) to the chromosomes.
Q7.
Arrange the order of events taking place in anaphase II stage of meiosis:
a. Metaphase plate spilts
b. Each chromosome moves away from equatorial plane
c. Centromeres split and chromatids separate.
d. Chromatids move to opposite poles
Answer : Option B
Explaination / Solution:
During anaphase stage, metaphase plate splits and each chromosome moves away from equatorial plane splitting the centromere and separate chromatids which move to opposite poles.
Q8. Which one is not a significance of meiotic cell division?
Answer : Option B
Explaination / Solution:
Meiosis cell division results in halving of chromosome number in daughter cells, recombination of genes and formation of spores and gametes.
Q9. In telophase I, which of the following event takes place?
Answer : Option C
Explaination / Solution:
In telophase I, the nuclear membrane and nucleolus reappear indicating the process of completion od nuclear division . Meiosis II is similar to mitosis.
Q10. Synapsis occurs between
Answer : Option C
Explaination / Solution:
Synapsis occur between two homologous chromosome during zygotene phase of prophase of meiosis I due to presence of synaptonemal complex between homologous chromosomes.
