Question # 1

The autosomal non disjunction in man in which 21st pair of chromosome fail to segregate resulting in gametes with 24 chromosomes is.

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Down's syndrome

Klinfilter syndrome

Turner's syndrome

Jacob's syndrome

Mitosis may be divided into two phases

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Karyikinesis & cytokinesis

Karyikinesis & diakinesis

Diakinesis & cytokinesis

Exokinesis & endokinesis

The stage that lasts for days, weeks or event years

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Zygotene

Leptotene

Pachytene

Diplotene

A network of very fine threads called chromatin can be visualized in call during

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Interphase

Prophase

Metaphase

Anaphase

Chromatin network is visible during

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Interphase

Prophase

Anaphase

Metaphase

Nerve cells and eye lens cells remain in stage for life time.

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G0

G1

S

G2

Fertilization of the ovum normal occurs:

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In the upper thrid of the oviduct

In the lower thrid of the oviduct

In the uterus

Can take place succcessfully in vegina

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

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

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Endometrium

Perimetrium

Tunica albuginea

Myometrium

Cancer is caused mainly by mutation in.

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somatic cells

Sex cells

Malignant cells

Reproductive cells

Cell cycle involves.

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Growth of cell

Replication of DNA

Cell division

None of these

Chiasmata formation take place duirng.

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Leptotene

diakinesis

Diplotene

Pachytene

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

Crossing over and random assortment of chromosomes are two significant happenings of

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Mitosis

Amitosis

Meiosis

All a,b,and c

An unwanted clone of cells and establishment of secondary areas of growth is called.

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Tumor

Growth

Lump

Swelling

Shape of the plant cell does not change greatly compared with an animal cell because it is surrounded by a rigid

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Cell membrane

Capsule

Sheath

Cell wall

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