The Chromosome Basis of Genetic Variation Flashcards
1
Q
Chromatin makeup
A
- DNA
- DNA- metabolising enzymes
- Histones (structural proteins)
2
Q
DNA content of cells notation
A
C represents amount of DNA in cell
3
Q
Organisation of human genome
A
30% coding
70% non-coding
4
Q
Prophase
A
- Spindle fibres appear
- Chromosomes condense
- Breakdown of nuclear membrane
5
Q
Prometaphase
A
- Spindle fibres attach to chromosomes
- Chromosomes condense
6
Q
Metaphase
A
-Chromosomes align
7
Q
Anaphase
A
- Centromeres divide
- Sister chromatids move to opposite poles
8
Q
Telophase
A
- Nuclear membrane reforms
- Chromosomes decondense
- Spindle fibres disappear
9
Q
Cytokinesis
A
- Cytoplasm divides
- Parent cell becomes 2 daughter cells with identical genetic information
10
Q
Prophase I
A
- Chromosomes begin to condense
- Homologous chromosomes pair
- Crossing over occurs
- Recombinant chromosomes form
11
Q
Metaphase I
A
- Spindle fibres attach to chromosomes
- Chromosomes line up in middle of cell
12
Q
Anaphase I
A
Chromosomes start to move to opposite ends of cell as spindles shorten
13
Q
Telophase I
A
- Chromosomes reach opposite ends
- Nuclear membrane forms
14
Q
Prophase II
A
- Chromosomes begin to condense
- Nuclear membrane dissolves
- Spindle fibres form
15
Q
Metaphase II
A
- Spindle fibres attach to chromosomes
- Chromosomes line up in centre of cell
