n: number of different types of chromosomes in that species, n=23 for humans. We have chromosomes in pairs (except in gametes), remember Aa from inheritance last year.
Slide 4 - Slide
The G1, S and G2 phase together make up the:
A
Cell cycle
B
Interphase
C
Mitosis
D
Growth phase
Slide 5 - Quiz
In which phase of the cell cycle are organelles formed?
A
M phase
B
G1 Phase
C
G2 Phase
D
S phase
Slide 6 - Quiz
What is the structure called that connects the chromatids?
A
Centriole
B
Centromere
C
Controsome
Slide 7 - Quiz
Which applies?
A
4 chromosomes, 8 chromatids
B
8 chromosomes, 8 chromatids
C
8 chromosomes, 4 chromatids
D
8 chromosomes, 16 chromatids
Slide 8 - Quiz
Which applies?
A
4 chromosomes, 8 chromatids
B
8 chromosomes, 8 chromatids
C
8 chromosomes, 4 chromatids
D
8 chromosomes, 16 chromatids
Slide 9 - Quiz
Slide 10 - Slide
M-phase
Cell division
Two options: - Mitosis: creating exact copies of the original cell for growth and repair - Meiosis: creating cells with half the number of chromosomes for reproduction (the gametes)
Slide 11 - Slide
Mitosis
One cell will split in two exact copies
2n (46) --> 2n + 2n
Slide 12 - Slide
Prophase
Chromosomes condense: each has two chromatids
Nuclear membrane starts breaking down
Spindle apparatus appears
Slide 13 - Slide
Metaphase
Centromeres lined up on the equator
Each chromatid attached to a spindle fibre
Slide 14 - Slide
Anaphase
Separation of the sister chromatids
Sister chromatids move to opposite poles, now called chromosomes
Slide 15 - Slide
Telophase
Chromosomes have reached poles
Nuclear membranes start forming
Chromosomes uncoil, become less visible
Slide 16 - Slide
Cytokinesis
Actual splitting of cytoplasm
Slide 17 - Slide
Homework
Watch the two video's below
Complete the worksheet Mitosis on the Classroom and hand in before next lesson