1. Mitosis
Noadswood Science, 2016

2. Mitosis
Wednesday, July 04, 2018
To explain the process of mitosis

3. Precise Learning
Cells divide in a series of stages called the cell cycle. Students should be able to describe the stages of the cell cycle, including mitosis.
During the cell cycle the genetic material is doubled and then divided into two identical cells.
Before a cell can divide it needs to grow and increase the number of sub-cellular structures such as ribosomes and mitochondria. The DNA replicates to form two copies of each chromosome.
In mitosis one set of chromosomes is pulled to each end of the cell and the nucleus divides.
Finally the cytoplasm and cell membranes divide to form two identical cells.
Students need to understand the three overall stages of the cell cycle but do not need to know the different phases of the mitosis stage.
Cell division by mitosis is important in the growth and development of multicellular organisms.
Students should be able to recognise and describe situations in given contexts where mitosis is occurring.

4. Size

5. Nucleus
The genetic information passed from parent to offspring is contained in genes, carried by chromosomes in the nucleus
All body cells have a nucleus which contains all genetic information
nucleus

6. Chromosomes & Genes
A gene is a section of DNA that carries the code for a particular protein (made from joined amino acids)
Different genes control the development of different characteristics of an organism – many genes are needed to carry all the genetic information for a whole organism
Chromosomes, found in the cell nucleus, contain many genes

7. Each chromosome is a very long molecule of tightly coiled DNA
Chromosomes and their genes are made of a molecule called DNA
DNA molecules carry the code that controls what your cells are made of and what they do
Each chromosome is a very long molecule of tightly coiled DNA

8. Mitosis
Mitosis is the type of cell division that leads to growth or repair
When a cell divides by mitosis: -
Two new cells form
Each cell is identical to the other one, and the cell they were formed from

9. MITOSIS STAGES
The pictures show cell division – can you work out the order? C D A E B

10. MITOSIS STAGES

11. Mitosis Stages Parent cell
Chromosomes make identical copies of themselves
They line up along the centre
They split
They move apart
Two daughter cells form with identical chromosomes to the parent cell

12. Stages

13. Stages

14. Practice Questions – Application
Different animals have different numbers of chromosomes in their body cells and in their gametes…
Dog body cell – 78 chromosomes
Cat egg cell – 19 chromosomes
Horse sperm cell – 32 chromosomes
How many chromosomes are there in a dog sperm cell?
How many chromosomes are there in a body of a cat?
How many chromosomes are there in a horse egg cell?

15. Answers
Different animals have different numbers of chromosomes in their body cells and in their gametes…
Dog body cell – 78 chromosomes
Cat egg cell – 19 chromosomes
Horse sperm cell – 32 chromosomes
How many chromosomes are there in a dog sperm cell – 39
How many chromosomes are there in a body of a cat – 38
How many chromosomes are there in a horse egg cell – 32