Question # 1

The number of sets of microtubules originate from each pair of centriole is.

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03

04

05

06

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

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

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7th

15th

19th

21st

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

In turner syndrome the affected person have set of chromosomes.

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XO

XXY

XYY

XXO

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

What are significant happening of meiosis.

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Crossing over

Random assortment of chromosome

Linkage

Crossing over and random assortment of chromosomes

Phragmoplast is formed by vesicles originated from.

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Endoplasmic reticulum

Golgi complex

Mitochondria

Chloroplast

Nuclear membrane disorganizes at the beginning of

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Prophase 1

Metaphase 1

Anaphase 1

Telophase 1

Pairing of homologous chromosomes for tetrad formation starts at.

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Leptotene

Zygotene

Diplotene

Pachytene

The laptotene and zygotene lasts for.

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Few hours

Few days

Few weeks

Few years

Karyokinesis involves division of nucleus and cytokinesis refer to

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Division of whole cell

Division of centromere

Division of cytoplasm

Division of cell wall

The corpus luteum is formed at the site of

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Fertilization

Ovulation

Mensturation

Implantation

The phase of meiosis during which nuclei disappear int he cell is called.

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Pachytene

Leptotene

Zygotene

Diplotene

Meiosis occurs only in

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Haploid cell

Diploid cells

Pentaploid cells

Triploid cells

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

Seperation of homologous chromosomes occur during..

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Anaphase

Prophase

Metaphase

Telephase

In non disjunction, chromosome's fail to segregate during.

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Prophase

Metaphase

Anaphase

Telephase

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