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B1 ­ Revision cards
Most of your features are affected by your genes and your environment.

Chromosomes = very long molecules of DNA Clones = genetically identical organisms
Genes = instructions for making proteins

Huntington's disease Cystic Fibrosis
Genetic disorder Genetic disorder
Symptoms don't appear until middle Causes breathing and…

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Alleles ­ different version of the same genes

Genotype ­ the alleles that you inherit

Phenotype ­ what you look like (your characteristics)

You only need one copy of a dominant allele to have its feature. You must have two
copies of a recessive allele to have its feature.


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Why people believe that a termination would be wrong?

An unborn child has the right to life
It should be protected from harm in the same way as people are protected after they
are born
Terminating pregnancy is unnatural, we should not interfere

Supporting ­ genetic screening Not supporting ­…

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Should human embryo cloning (to get unspecialised cells) be allowed?


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