mitosis Flashcards

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1
Q

chromosome

A

long DNA molecule

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2
Q

homologous

A

matching pair of chromosomes

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3
Q

gene

A

length of DNA that codes for a protein

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4
Q

allele

A

different version of the same gene

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5
Q

dominant

A

will always be expressed if present

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6
Q

recessive

A

only be expressed if there are 2

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7
Q

chromatid

A

2 identical copies of the DNA held together at the centromere

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8
Q

centromere

A

region where 2 chromatids are held together

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9
Q

condensed

A

coiled using histones

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10
Q

diffuse

A

unravelled and unreplicated

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11
Q

prophase

A

chromosomes condense and spindles begin to form

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12
Q

interphase

A

chromosomes are diffuse

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13
Q

metaphase

A

centrioles made spindles and chromosomes move to the equator

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14
Q

anaphase

A

centromere pulled by spindles and pulls the chromatids apart

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15
Q

telophase

A

nuclear envelope reforms and chromosomes condense

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16
Q

cytokinesis

A

cytoplasm divides into 2

17
Q

G1

A

growth 1: cell growth, protein synthesis, replicating organelles

18
Q

S

A

synthesis phase: DNA is replicated

19
Q

G2

A

growth 2: preparing for mitosis, increase the energy store, checks DNA and replicating organelles

20
Q

significance of mitosis

A

growth of organism, tissue repair and asexual reproduction

21
Q

mitotic index

A

number of cells dividing/ total number of cells x100