HGA2 - Mitosis Flashcards
0
Q
Homologous chromosomes
A
a pair of chromosomes having the same gene sequence each derived from 1 parent
• not completely identical (different mutations)
1
Q
Mitosis
A
- nuclear division into 2 nuclei
- results in 2 daughter cells identical to the parent nucleus
- same number of chromosomes and genetic content as original cell
- cytokinesis – division of rest of the cell
2
Q
Centromere
A
attaches spindle fiber (motors up to poles)
3
Q
Metacentric
A
centromere is in the middle
4
Q
Acrocentric
A
centromere is closer to 1 end
5
Q
Cell cycle
A
G1
S
G2
M
6
Q
G1
A
interphase – 11 hours
gap before duplication
7
Q
S
A
7 hours
DNA synthesis and chromosome duplication
8
Q
G2
A
interphase - 4 hours
gap before mitosis
9
Q
M
A
Mitosis – 2 hours • prophase • metaphase • anaphase • telophase
10
Q
Centrosome
A
- makes microtubules
- organizes microtubules
- contains 2 centrioles
11
Q
Prophase
A
- chromosomes condense
- centrosomess move to opposite poles, new microtubules
- nucleoli begin to disappear
12
Q
Metaphase
A
• chromosomes align on metaphase plate with sister chromosomes facing opposite poles
13
Q
Anaphase
A
- centromeres split
* separated chromatids to opposite poles
14
Q
Telophase
A
- nuclear membrane and nucleoli re-form
- spindle fibers disappear
- chromosomes uncoil and become a tangle of chromatin
