Question # 1

An organism has 4 pairs of chromosoems . Afger meiosis-I , how many chromosomes and chromatids will be present in each daughter cell.

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8 Chromosomes and 16 chromatids

4 chromosomes and 8 chromatids

4 chromosomes and 4 chromatids

8 chromosomes and 8 chromatids

How does the centrosome contribute to mitosis.

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Initiates DNA replication

Make mitotic spindle

Forms the nuclear envelope

Duplicates organelles

Which event is unique to meiosis but not mitosis.

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DNA Replication

Crossing over

Chromosomes alignment

Nuclear division

In which phase of cell cycle, the chromosomes duplicate.

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S Phase

G1 Phase

Mitosis

G2 Phase

Centrosomes make mitotic spindle in.

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Plant cells

Animal Cells

Prokaryotic cells

All of these

The longest phase of meiosis is.

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Prophase I

Prophae II

Interphase I

Interphase II

Substance and energy required for replication for DNA is accumulated in cell during.

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G1

G2

S-Phase

M-Phase

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.

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14

28

56

09

All of the following event takes place both in mitosis and meiosis except.

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Condensation of chromatin to form chromosomes

Formationof spinde apparatus

Nuclear envelop and nucleolus disappear

Chromosomes pair for crossing over

Crossing over resuts in genetic recombination . It occurs between

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Two chromatids of homologous chromosomes

Two chromatids of opposite gametes

Two chromatids of any two non homologous chromosomes

Two chromatids of the same chromosome

The spindle apparatus of plants differs from that of animals innot having.

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Microtubules

Centromere

Centrioles

Equator of spindle

What causes the number of chromosomes to reduce to half when a cell divides by meiosis.

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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

At which stage of mitosis chromosomes line up in the centre.

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Prophase

Anaphase

Metaphase

Telophase

In which phase of cel cycle, maximum growth occurs inc ell.

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M Phase

S Phase

G2 Phase

G1 Phase

During celll division spindle fibres attach a chromosome at.

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Telomere

Centromere

Upper arm of chromosomes

Lower arm of chromosome

Which one is the feature of mitosis but not of meiosis II?

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Crossing over

Separation of sister chromatids

Daughter cells with same number of chromosomes

Sepearation of homologous chromosomes

If you observe a cell in which nuclear memberane is reforming around two sets of chromosomes, what stage of cell cycle is this

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Anaphase

Telephase

Metaphase

Prophase

Chromosomal number of fruit fly is 8 The gametes of fruit fly contain.

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2 Chromosomes

4 Chromosomes

8 Chromosomes

16 Chromosomes

Why is meiosis II necessary after meiosis I?

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To replicate chromosomes

To separate sister chromatids

To ensure genetic recombination

To reduce chromosomes number

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