Cell Cycle Division Flashcards

1
Q

Cell Cycle Def.

A

Process by which cells divide passing their DNA onto genetically identical daughter cells

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2
Q

Consequences of faults in DNA replictation

A

Chromosome Anomalies (mutation), inherited disease and cancer

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3
Q

G0 in cell cycle

A

Optional non-replication phase. Differentiated cells tend to remain in this phase

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4
Q

G1 Cell Cycle (10 hrs)

A

A period of cell growth in preparation for cell division. All cell components excluding chromosomes are duplicated

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5
Q

S (synthesis-phase) Cell Cycle (5 hrs)

A

DNA (chromosome) replication occurs. A second double helix is formed

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6
Q

G2 Cell Cycle (3-4 hrs)

A

Resting phase before cell division. Checks chromosomes for replication error and repairs are made

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7
Q

Mitosos (2hrs)

A

Dividing of cell into identical daughter cells. Daughter cells recieve 1 of each chromosome

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8
Q

Cytokenisis

A

Daughter cells form and split from eachother

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9
Q

Mitosis Stages

A

Prophase, ProMetaphase, Metaphase, Anaphase + Telophase and cytokinesis

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10
Q

Prophase Outline

A

Chromosome containing 2 sister double helixes condenses and becomes visible. Bipolar spindles develop

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11
Q

Prometaphase

A

Nuclear envelope dissolves. Chromosomes migrate to equatorial plate (metaphase plate)

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12
Q

Metaphase

A

Fully condensed chromosomes exist at metaphase plate. Kinetochore microtubule of aster poles are attached to centromeres

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13
Q

Anaphase

A

Centromere splits and chromosome pairs are pulled to opposite sides

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14
Q

Telophase

A

Chromosomes at poles recondense, nuclear membrane reforms and cytoplasm begins to split

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15
Q

Cytokenisis Outline

A

Cytoplasm fully splits into 2 identical daughter cells

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16
Q

Centrosome Def.

A

Form cell poles, microtubule organisation centre. Polar fibres grow out

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17
Q

Kinetochore Def.

A

Protein structure at centromere attaches chromatids to spndle fibres via kinetochore microtubules

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18
Q

Centromere Def.

A

DNA sequence necessary for cell segregation during division. Chromatids without centromeres won’t be separated by spindle fibres pulling them apart (as they couldn’t attach), thus won’t be passed onto daughter cells

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19
Q

Meiosis Def.

A

Produces haploid cells (gametes)

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20
Q

How many times does a cell divide by meiosis

21
Q

Stages of Meiosis (I and II)

A

Prophase I, Metaphase I, Anaphase I, Telophase & cytokinesis I. Prophase II, Metaphase II, Anaphase II and Telophase & Cytokinesis II

22
Q

Differences at metaphase mitosis and meiosis

A

In meiosis parental and maternal homologs associate and stand at metaphase plate in bivalent formation. In mitosis parental and maternal homologs don’t associate and stand signally at metaphase plate

23
Q

Number of rounds of DNA synthesis in both mitosis and meiosis

24
Q

Differences in mitosis and meiosis

A

cell divides once in mitosis and twice in meiosis, parental & maternal homologs associate in meiosis and don’t in mitosis, recombination is abnormal in mitosis but frequent in meiosis, daughter cells differ (haploid) in meoisis and are identical (diploid) in mitosis

25
2 Ways Diversity Is Created in Meiosis
Recombination and Independent Assortment
26
Recombination Def.
Breakage of the DNA duplex in 1 maternal and 1 paternal chromatid + joined at ends. DNA is transferred (none lost or gained)
27
Non-Disjunction
When recombination accidentally happens in mitosis and DNA sequences are lost
28
Independent Assortment Def
Spindle fibres pulls 2 chromatids towards pole. With each chromatid having an equal chance to be pulled a specific pole
29
Chiasmata DEf.
Same function as centromere acts as a crossing over point between homologs. Holds homologs together until Anaphase I. Lach of chiasmata may result in incorrect chromosome number in cells
30
Where in meiosis to oocytes stop before puberty
Prophase 1
31
32
Name of cell gametes form from in females
Ooginium to primary oocyte
33
Name of cell gametes form from in males
Spermatotangium and primary spermocyte
34
Polar body function in gamete formation
Get rid of spare set of chromosome
35
Gamete cell in females
Ovum
36
Gamete cell in males
Spermatoza
37
Allele Def.
Copy of a gene. Vary by their DNA base sequence
38
Polymorphism
In populations genes have many alleles
39
GTA and GTB genes
Stimulates glycotransferes which glycosates proteins in proteins and lipids on cell membrane. Forming A and B antigens
40
What would result in heterozygous GTA and GTB
Co. Dominance AB blood type
41
GTA transfers
N-acetylgalactosamine
42
GTB Tranfers
Galactose
43
GTO genes
Doesn't activate an enzyme
44
Human Inherited Disease
Genetic (DNA) defects. Genotype effects Phenotype
45
Monogenic Defects Def.
Disease carried by dominant/recessive gene. Follows simple Mendelian pattern
46
Polygenic Defects
Several gene interactions cause disease. Non-Mendelian
47
Euchromatic Def.
Mainly C-G pairs + more transcriptionally active
48
Heterochromatin
Mainly A-T pairs and less transcriptionally active