Write whether the genes in these groups of cells are the ‘same’ or ‘different’.

The cells in a brother and sister

Write whether the genes in these groups of cells are the ‘same’ or ‘different’.

A mother's egg cells

Write whether the genes in these groups of cells are the ‘same’ or ‘different’.

A father’s sperm cells

Write whether the genes in these groups of cells are the ‘same’ or ‘different’.

Each fertilised egg a man and woman produce

Write whether the genes in these groups of cells are the ‘same’ or ‘different’.

The cells in a growing embryo

How many copies of every gene does a cell have?

Each fertilised egg has a combination of genes,

since the two copies of genes come from the sperm

and the other two from the egg.

A fertilised egg cell divides in two, this means that each cell has genes.

When does the nucleus get copied?

When do genes change?

A basic physical and functional unit of heredity

Made up of DNA

A copy of the genes we inherited is stored in .................... of every cell

Each egg and sperm cell contains ................................of each parent’s genes.