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biology > cell division > Flashcards

cell division Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

stage at which chromosome become visible in light microscope

A

leptotene

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2
Q

the compaction of chromosome

A

continues through out leptotene

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3
Q

synapsis occurs at

A

zygotene

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4
Q

paired chromosomes in zygotene is called as

A

homologous chromosomes

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5
Q

which indicate the formation of synaptonemal complex

A

electron micro graph

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6
Q

bivalent ,tetrad

A

chromosomes,chromatid

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7
Q

four chromatid of each bivalent is clearly visible in

A

pachytene

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8
Q

pachytene is characteristed by

A

recombination nodules

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9
Q

crossing over occurs at

A

non sister chromatids and homologous chromosome

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10
Q

diplotene

A

dissolution of synaptonemal complex

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11
Q

Interphase Dna and chomosome

A

Dna… Doubles, chromosome remains same

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12
Q

Mitosis observed by

A

Strasbourg in plant cell and by Walter Flemming in animal cell

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13
Q

Spireme stage appear in

A

Prophase

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14
Q

Metaphase chromosome are

A

Thickest and shortest

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15
Q

Colchine inhibit mitosis by

A

Inhibiting formation of microtubule

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16
Q

Furrow movement

A

Centripetal

17
Q

Phragmoplastis formed by

A

Golgi body grow centrifugal to form cell plate

18
Q

Mitogens

A

Induce mitosis

19
Q

Eg of mitogens

A

Auxin, insulin

20
Q

Number of mitotic division req for formation of n numbers of cells are

A

N-1

21
Q

Number of mitotic division req for formation of n numbers of cells are

A

N-1

22
Q

Poison of prophase

A

Ribonuclease, azide, cynide

23
Q

Chalknes

A

Inhibit mitosis

24
Q

Phistone protein

A

S phase

25
Q

Most of organelle duplicate in (interphase

A

G1

26
Q

Increase in chromosome is first appeared in…… Stage

A

Anaphase

27
Q

Terminalisation of chaismata

A

Diakinesis

28
Q

Metaphase 1

A

Double metaphase plate is formed

29
Q

Reduction in number of chromosome occurs in

A

Anaphase 1

30
Q

In oocyte of some vertebrae,……… Can last for months are years

A

Diplotene

31
Q

Homologous chromosome begin to Seprate

A

Diplotene

32
Q

Amitosis

A

Direct cell division.. Remak

33
Q

Anastral

A

Plant.. Aster formation is absent

34
Q

Akmals a

A

Amphiastral

35
Q

Number of gene of mitosis for producing x cells is

A

2n

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