Question # 1

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

The laptotene and zygotene lasts for.

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Few hours

Few days

Few weeks

Few years

RNA and Protein called.

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Insulin

Tubulin

Actin

Myosin

The human egg is swept through the oviduct toward the uterus by:

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The beating of the egg's cilia

Rhythmic contraction of the uterus

Rhythmic contraction of the oviduct

The beating of the cilia in the oviduct

Synapsis occurs duiring.

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Pachytene

Leptotene

Zygotene

Diplotene

During which stage chromosomes are doubling

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G2 Phase

G1 phase

S-Phase

G0 Phase

Pairing of homologous chromosomes for tetrad formation starts at.

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Leptotene

Zygotene

Diplotene

Pachytene

Microtubules are composed of protein, tubulin and traces of.

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DNA

Glycolipid

RNA

Phospholipid

The individuals have additional sex chromosome in

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Klinefelter's syndrome

Turner's syndrome

Down's syndrome

Sach's syndrome

During cell division , the nuclear division is called

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Cytokinesis

Karyokinesis

Endomitosis

Plasmolysis

Monqolism is the other name of.

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Mongolism

Kline felter syndrome

Down's syndrome

Turner's syndrome

Each bivalent has

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Twochromatids

Four chromatids

Both a & b

None of these

The chances of teenage mother having down's syndrome child is.

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One in one hundred

One in many thousand

One in one thousand

One in ten thousand

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

Cancer is caused mainly by mutation in.

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somatic cells

Sex cells

Malignant cells

Reproductive cells

The average cell cycle in human is.

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24 hours

26 hours

28 hours

30 hours

The period of life cycle of cell between two consecutive divisions is termed as.

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Resting phase

Inter phase

G1 phase

G2 Phase

Which pair of chromosome fails to segregate in down's syndrome.

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7th

15th

19th

21st

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Biology FSC Part 2 Chapter 21 Online MCQ's Test MCQs With Answers

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