A farmer in Kenya wants to develop a breed of maize that is resistant to drought. She selects plants that survive longest without water and breeds them together. After several generations, what will be the most likely outcome?

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Question

A farmer in Kenya wants to develop a breed of maize that is resistant to drought. She selects plants that survive longest without water and breeds them together. After several generations, what will be the most likely outcome?

Accepted Answer

the proportion of plants with drought resistance will increase — Award 1 mark for recognising that selective breeding gradually increases the frequency of desired alleles. A is incorrect because complete resistance is unlikely and other environmental factors remain important. C is incorrect because other characteristics can be maintained if they do not conflict with drought resistance. D is incorrect because selective breeding reduces genetic variation.

Answer

the plants will lose all other beneficial characteristics

Answer

all plants will be completely resistant to drought

Answer

the genetic variation will increase in the population

Answer

the proportion of plants with drought resistance will increase

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