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A ____ codes for a characteristic.
An ______ is a different version of a gene.
A ________ allele always shows.
When a gene is __________ there are two of the same allele.
With a _________ we can see far away planets.
Visible light is part of the _______________ spectrum.
Gammar rays are a type of ionising _________.
When a wave refracts it changes speed and direction.
When light reflects it bounces off a surface.
A ______ is a collection of stars and planets.