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The students are all in the same age group.
Height is controlled by several different genes.
Height is affected by environmental factors such as lifestyle.
Height is affected by the number of students in the class.
All children grow at the same rate.
The students are all the same sex.
...have a vaccination.
...have the pregnancy terminated.
...name the baby after a grandparent.
...have an anaesthetic during the baby's birth.
...have any more children.
...tell the grandparents the sex of the foetus before it is born.
The clone is genetically different to the donor.
The clone has two nuclei in each cell.
A new nucleus is placed in an empty egg cell.
The donor nucleus is removed from an adult body cell.
The nucleus is removed from an egg cell.
Embryos can be used to make stem cells.
Each clone has different DNA.
Half the clones are male, and half the clones are female.
The cloned cells never become specialised.
The stem cells may be used to treat some diseases.