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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 have selected the largest chickens for breeding over several generations. They observe traits such as size and weight and choose those individuals that exhibit these desirable characteristics. This process of selection allows certain genes that promote larger body size to become more prevalent in the population, ultimately leading to the development of larger chickens.
Step 2
Describe one benefit and one risk of selectively breeding chickens.
Answer
Benefit: One significant benefit of selectively breeding chickens is increased meat production, as larger chickens tend to provide more meat, which is advantageous for farmers and consumers alike.
Risk: A potential risk of selectively breeding chickens is the reduction in genetic diversity, which can make the population more susceptible to diseases and environmental changes.
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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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Understanding genetic diseases: By sequencing the DNA of various species, scientists can identify genetic markers associated with diseases, aiding in medical research and treatment.
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Conservation efforts: Knowledge of genetic sequences can help in preserving endangered species by understanding their genetic diversity and development.