1. Nucleus is removed from donor egg and replaced with a nucleus extracted from a parent’s skin cell
2. The donor egg discards half of its chromosomes, leaving a single set
Nucleus
Nucleus
Skin cell
Donor egg with
nucleus removed
Egg with a single
set of chromosomes
3. The egg can then be fertilised with sperm
4.The fertilised egg has an equal number of chromosomes from both parents
Sperm
1. Nucleus is removed from donor egg and replaced with a nucleus extracted from a parent’s skin cell
2. The donor egg discards half of its chromosomes, leaving a single set
3. The egg can then be fertilised with sperm
4.The fertilised egg has an equal number of chromosomes from both parents
Sperm
Nucleus
Nucleus
Skin cell
Donor egg with
nucleus removed
Egg with a single
set of chromosomes