Describe the cell cycle, mitosis and meiosis

Question 1

2 phases of Cell Cycle

Answer 1

Interphase then Mitosis

Question 2

Interphase (5)

Answer 2

The cell is growing in size, is metabolically active, making proteins, DNA is replicated and checked for errors (errors = mutation), ready to divide.

Question 3

DNA Replication (6) D,H,B,N,B,T

Answer 3

DNA unwinds
Hydrogen bonds between base pair peaks
Bases are exposed
New nucleotides attach to exposed bases
Both sides are completed
The result is 2 identical strands

Question 4

Mitosis

Answer 4

A process that helps organisms grow, develop and repair - the division of body cells

Question 5

4 Mitosis phases

Answer 5

Prophase
Metaphase
Anaphase
Telophase

Question 6

Mitosis Prophase (4)

Answer 6

Chromatin condense and thicken forming chromosome.
Then it duplicates.
The nuclear envelope breaks down.
Centrioles moves to opposite ends of cell

Question 7

Mitosis Metaphase (1st step)

Answer 7

Duplicated chromosomes align in the middle

Question 8

Mitosis Anaphase (2nd step)

Answer 8

Sister chromatids of duplicated chromosomes seperate and being moving to opposite ends of the cell

Question 9

Mitosis Telophase (3rd step)

Answer 9

Nucleus begins to form at opposite ends,

Question 10

Meiosis

Answer 10

Cell division that occurs only in ovaries & testes producing gametes containing one set of chromosomes.

Question 11

Meiosis Prophase (1st step - crossing over) (3)

Answer 11

Homologous chromosomes come together to form a tetrad. Portions of chromatids break off and attach to adjacent chromatids on the chromosome. This allows for more genetic variability.

Question 12

Meiosis Metaphase (2nd step - independent assortment)

Answer 12

Homologous chromosomes line up randomly at centre of cell and pair with there homologous partner

Question 13

Meiosis Anaphase (3rd step)

Answer 13

Homologous chromosomes seperate