第 1 题
1 分In the process of selective breeding, what is the specific role of the human breeder?
Pearson Edexcel IGCSE · Biology
Selective breeding：练习题
5 道选择题即时批改，另有 5 道文字题附完整解题步骤，全部围绕「Selective breeding」。
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第 2 题
1 分Which of the following describes a significant biological disadvantage of selective breeding in agricultural animals?
第 3 题
1 分When selectively breeding sheep to increase wool quality, why is it necessary for the breeder to select offspring over many generations rather than just one?
第 4 题
1 分When starting a program of selective breeding in sheep to increase wool quality, what is the first step the farmer must take?
第 5 题
1 分What is typically the first step when a farmer begins a selective breeding programme to improve the yield of a crop?
第 6 题
4 分Describe the basic process used by a farmer to selectively breed a variety of tomato plant that produces larger fruits.
先自己写一遍答案，再对照解题步骤。
第 7 题
5 分Explain how selective breeding can be applied in animal farming to improve the efficiency of meat production.
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第 8 题
5 分Compare selective breeding with natural selection, highlighting a key difference in the driving force and the outcome for the species.
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第 9 题
4 分A plant breeder wants to develop a new variety of wheat that has a short stem and a high grain yield.
a) Describe the steps the breeder would take to produce this variety using selective breeding.
b) Explain why this process must be repeated over many generations.
先自己写一遍答案，再对照解题步骤。
第 10 题
5 分While selective breeding is beneficial for food production, it can lead to biological problems.
a) Explain how selective breeding reduces the gene pool of a population.
b) State two potential disadvantages for animals that have been highly selectively bred.
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