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Cleona Aston B1 REVISION




Genes are found in our chromosomes, which parents pass on to offspring in their sex cells in
reproduction. Different versions of the same gene are called alleles, and these can determine
features like eye colour, and the inheritance of disorders such as cystic fibrosis.

The nucleus…

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Cleona Aston B1 REVISION




Different versions of the same gene are called alleles. They can be either recessive or dominant.
Genetic testing can determine whether a person is carrying the alleles that cause genetic disorders.

A recessive allele only shows if the individual has two copies of it. For example,…

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Cleona Aston B1 REVISION




There are two types of stem cells:

Adult stem cells - these are unspecialised cells that can develop into many (but not all) types
of cells
Embryonic stem cells - these are unspecialised cells that can develop into any type of cell.



During the development of…

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Cleona Aston B1 REVISION




Summarise different views that might be held. For instance, some people think that destroying
human embryos this way is murder. Others believe it is furthering our knowledge of science for the
benefit of everyone

Identify and develop arguments based on the idea that the right decision…

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