A breeder repeatedly mates closely related guinea pigs chosen for calm behaviour.
Which outcome is a risk of this breeding programme?
The offspring are more likely to show a wider range of characteristics.
The offspring are more likely to develop new alleles for calm behaviour.
The offspring are more likely to cope well with a new disease.
The offspring are more likely to be born with inherited defects.
80 exam-style questions on AQA GCSE Biology 6.2 Variation and evolution, covering 6.2.1 Variation, 6.2.2 Evolution, 6.2.3 Selective breeding, 6.2.4 Genetic engineering, and 6.2.5 Cloning. Each one has a worked solution and a mark scheme showing where the marks go.