| 1 |
All of the following event takes place both in mitosis and meiosis except. |
Condensation of chromatin to form chromosomes
Formationof spinde apparatus
Nuclear envelop and nucleolus disappear
Chromosomes pair for crossing over
|
| 2 |
Chromosomal number of fruit fly is 8 The gametes of fruit fly contain. |
2 Chromosomes
4 Chromosomes
8 Chromosomes
16 Chromosomes
|
| 3 |
What causes the number of chromosomes to reduce to half when a cell divides by meiosis. |
Seperation of homologous chromosomes during meiosis I
Replication of DNA during interphase I
Seperation of sister chromatids of all the chromosomes durng meiosis I
Crossing over during meiosis I
|
| 4 |
The longest phase of meiosis is. |
Prophase I
Prophae II
Interphase I
Interphase II
|
| 5 |
Crossing over resuts in genetic recombination . It occurs between |
Two chromatids of homologous chromosomes
Two chromatids of opposite gametes
Two chromatids of any two non homologous chromosomes
Two chromatids of the same chromosome
|
| 6 |
The spindle apparatus of plants differs from that of animals innot having. |
Microtubules
Centromere
Centrioles
Equator of spindle
|
| 7 |
Some student of SSC observed a thin cross section ffrom root tip of onion plant under the microscope. They found divising cells at different stages of their life cycle. One of the students found a cell at late prophase and counted 28 chromosomes in it. The number of chromosomes in daughter cells should be. |
14
28
56
09
|
| 8 |
During celll division spindle fibres attach a chromosome at. |
Telomere
Centromere
Upper arm of chromosomes
Lower arm of chromosome
|
| 9 |
Substance and energy required for replication for DNA is accumulated in cell during. |
G1
G2
S-Phase
M-Phase
|
| 10 |
Why is meiosis II necessary after meiosis I? |
To replicate chromosomes
To separate sister chromatids
To ensure genetic recombination
To reduce chromosomes number
|
| 11 |
Which event is unique to meiosis but not mitosis. |
DNA Replication
Crossing over
Chromosomes alignment
Nuclear division
|
| 12 |
Which one is the feature of mitosis but not of meiosis II? |
Crossing over
Separation of sister chromatids
Daughter cells with same number of chromosomes
Sepearation of homologous chromosomes
|
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