Page 24 - CB1.3 Genetic Varation sciPAD

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24 CB 1.3 GENETIC VARIATION
PRINCIPLES OF GENETIC VARIATION
Hairless Rats
A rat breeder produced a rat that was unable to produce normal hair. He suspected it was due to
a mutation. The rat breeder noted that the parents of the hairless rat had normal hair.
Describe what a mutation is. In your answer you should:
•
define the term ‘mutation’.
•
explain what determines whether a mutation is able to be inherited or not.
•
explain why mutations may be described as the ‘ultimate source of variation’.

























A normal haired rat
A hairless rat
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