Question # 1

Synapsis occurs duiring.

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Pachytene

Leptotene

Zygotene

Diplotene

Downs syndrome (Mongolism) occurs in man during which 21^st chromosome falls to segregate resulting gamete with

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20 chromosomes

21 chromosomes

22 chromosomes

24 chromosomes

During cell division , the nuclear division is called

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Cytokinesis

Karyokinesis

Endomitosis

Plasmolysis

The series of changes which involve period of growths replication of DNA followed ny cell division may be named as

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DNA cycle

Nuclear cycle

Cell cycle

Chemical cycle

G₁ is time between the end of mitosis and initiation of DNA synthesis also called as

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Pre-DNA synthesis phase

DNA synthesis phase

Post-DNA synthesis phase

None of these

What are significant happening of meiosis.

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Crossing over

Random assortment of chromosome

Linkage

Crossing over and random assortment of chromosomes

Full cell cycle in yeast cells has length of.

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30 minutes

60 minutes

90 minutes

124 minutes

The prophase stage in which the chromosomes become visible, shorten and thick.

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Leptotene

Zygotene

Pachytene

Diphotene

Which of the following chromosome abnormalities lead to tallness, aggressiveness mental defect and anti social behavior.

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XXY

XXXY

XO

XYY

Interphase period can be divided into.

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G1,G2, G3

G1, G2, F1

G1, S, G2

S1, G1, S2

The uterine layer which is shed with each monthly cycle is:

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Endometrium

Perimetrium

Tunica albuginea

Myometrium

The corpus luteum is formed at the site of

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Fertilization

Ovulation

Mensturation

Implantation

Pairing of homologous chromosomes for tetrad formation starts at.

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Leptotene

Zygotene

Diplotene

Pachytene

The kinetochore fibres of spindle attach to the kinetochore region of chromosome and align them at the equator of the spindle forming

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Equatorial plate

Metaphase plate

Central plate

Both a & b

The basic difference betweenn spermatogenesis and oogenesis is that :

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During spermatogenesis two more polar bodies are produced

The mature ovum is haploid while the sperm is 1n

Spermatogenesis involves mitosis and meiosis, but oogenesis involves meiosis only

In oogenesis, one mature ovum is produced, and in spermatogenesis four mature sperm are produced

Interphase can further be divided into

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G₁-phase,S-phase and G₂-phase

G₁-phase,G₂-phase and G₃-phase

S₁-phase,S₂-phase and S₃-phase

S₁-phase,G-phase and S₂-phase

Trisomy of chromosome 18 is found in.

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Down's syndrome

Edward syndrome

Patau syndrome

Jacob's syndrome

Crossing over occurs during.

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Leptotene

Pachytene

Zygotene

Anaphase

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