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Farmers selectively breed chickens to produce larger chickens - Edexcel - GCSE Biology - Question 5 - 2020 - Paper 1
Question 5
Farmers selectively breed chickens to produce larger chickens. Figure 9 shows how the size of chickens has changed over time. (i) Explain how farmers have used sel... show full transcript
Worked Solution & Example Answer:Farmers selectively breed chickens to produce larger chickens - Edexcel - GCSE Biology - Question 5 - 2020 - Paper 1
Step 1
Explain how farmers have used selective breeding to produce larger chickens.
Answer
Farmers select parent chickens with desirable traits, such as larger size, to mate and produce offspring. By continuously selecting the largest offspring over generations, they enhance the likelihood of producing ever larger chickens. This process takes advantage of natural variations within the chicken population, gradually leading to an increase in average size.
Step 2
Describe one benefit and one risk of selectively breeding chickens.
Answer
Benefit: Selectively breeding chickens can lead to increased meat production, ensuring a more efficient food supply for consumers.
Risk: A major risk of selective breeding is reduced genetic diversity, which can make chickens more susceptible to diseases and adverse environmental conditions.
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Step 6
State two benefits of discovering the sequence of bases for all plants and animals.
Answer
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It can lead to advancements in medical research, allowing for targeted therapies and a better understanding of genetic diseases.
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It provides insights into biodiversity, aiding in conservation efforts and the sustainable management of natural resources.