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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 sele... 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 used selective breeding by selecting the largest chickens to reproduce. This process involves choosing parent chickens that show desirable traits, such as size and growth rates. Over several generations, these selected chickens are bred together, resulting in offspring that inherit the larger size characteristics. This selective process enhances the overall size of the chicken population over time.
Step 2
Describe one benefit and one risk of selectively breeding chickens.
Answer
Benefit: One benefit of selectively breeding chickens is the increased size and weight of the chickens, which can lead to higher meat yield, benefiting farmers economically.
Risk: One risk of selectively breeding chickens is the reduced genetic diversity, which can lead to increased susceptibility to diseases and reduced ability to adapt to changing environments.
Step 3
Step 5
Step 6
State two benefits of discovering the sequence of bases for all plants and animals.
Answer
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Understanding genetic information can lead to advancements in medicine and agriculture by allowing for targeted breeding and genetic modifications.
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It can enhance conservation efforts by identifying genetic traits that support the survival of endangered species.