A breeder uses selective breeding to increase meat production in turkeys. A small group of selected adults is used to produce each new generation. After many generations, a harmful condition caused by a recessive allele occurs more frequently among the young turkeys.
Suggest how the way these turkeys were bred led to the higher frequency of the condition.
100 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.