within the population some individual posses the gene for resistance to the antibiotic or it develops the genes by mutation ; such genes lead to production of enzyme which neutralize the antibiotic; the resistance forms survive the antibiotic hence transmit their advantages genes to their offspring; thus a new population of resistance strains is established(e mergence of new species(speciation)
Kavungya answered the question on June 15, 2019 at 08:27
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In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers:
(a) Identify the recessive...
(Solved)
In a breeding experiment, plants with red flowers were crossed. They produced 123 plants with red flowers and 41 with white flowers:
(a) Identify the recessive trait
(b) Give a reason for your answer
Date posted:
June 15, 2019
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Answers (1)
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Explain why insecticides become ineffective against insects if used for several years in succession
(Solved)
Explain why insecticides become ineffective against insects if used for several years in succession
Date posted:
June 15, 2019
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Answers (1)
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Briefly explain the term “survival for the fittest” as used in Darwin’s theory of natural selection
(Solved)
Briefly explain the term “survival for the fittest” as used in Darwin’s theory of natural selection
Date posted:
June 15, 2019
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Answers (1)
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Explain why certain drugs become ineffective in curing a disease after many years of use
(Solved)
Explain why certain drugs become ineffective in curing a disease after many years of use
Date posted:
June 15, 2019
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Answers (1)
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All insects are believed to have arisen from a common ancestor. However, modern insects differ widely in a variety of ways such as in the...
(Solved)
All insects are believed to have arisen from a common ancestor. However, modern insects differ widely in a variety of ways such as in the adaptation of their mouthparts for different modes of feeding. What kind of evolution is this?
Date posted:
June 15, 2019
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Answers (1)
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Distinguish divergent and convergent evolution
(Solved)
Distinguish divergent and convergent evolution
Date posted:
June 15, 2019
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Answers (1)
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Give two factors that determine water reabsorption in the distal convoluted tubule
(Solved)
Give two factors that determine water reabsorption in the distal convoluted tubule
Date posted:
June 15, 2019
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Answers (1)
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Distinguish between the struggle for existence and survival for the fittest as used in the theory of natural selection
(Solved)
Distinguish between the struggle for existence and survival for the fittest as used in the theory of natural selection
Date posted:
June 15, 2019
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Answers (1)
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State any two similarities in structure between Homo erectus and Homo Sapiens
(Solved)
State any two similarities in structure between Homo erectus and Homo Sapiens
Date posted:
June 15, 2019
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Answers (1)
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State role of cardiac sphincter in the stomach.
(Solved)
State role of cardiac sphincter in the stomach.
Date posted:
June 15, 2019
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Answers (1)
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Distinguish between camouflage and mimicry.
(Solved)
Distinguish between camouflage and mimicry.
Date posted:
June 15, 2019
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Answers (1)
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Give two examples of adaptive radiation in animals.
(Solved)
Give two examples of adaptive radiation in animals.
Date posted:
June 15, 2019
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Answers (1)
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Name one method that would be used to estimate the population of small fish in the ecosystem
(Solved)
Name one method that would be used to estimate the population of small fish in the ecosystem
Date posted:
June 15, 2019
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Answers (1)
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State the role of Leguminous plants in an ecosystem
(Solved)
State the role of Leguminous plants in an ecosystem
Date posted:
June 15, 2019
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Answers (1)
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State three disadvantages of using synthetic pesticides over Biological control.
(Solved)
State three disadvantages of using synthetic pesticides over Biological control.
Date posted:
June 15, 2019
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Answers (1)
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Describe how a population of grasshoppers in a given area can be estimated
(Solved)
Describe how a population of grasshoppers in a given area can be estimated
Date posted:
June 15, 2019
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Answers (1)
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Explain how food as a factor regulates the population of animals in an ecosystem
(Solved)
Explain how food as a factor regulates the population of animals in an ecosystem
Date posted:
June 15, 2019
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Answers (1)
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Apart from mere observation of actual feeding suggest two methods that can be used to determine the type of food eaten by animals
(Solved)
Apart from mere observation of actual feeding suggest two methods that can be used to determine the type of food eaten by animals
Date posted:
June 15, 2019
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Answers (1)
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What are the two main components of an ecosystem?
(Solved)
What are the two main components of an ecosystem?
Date posted:
June 15, 2019
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Answers (1)
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To estimate the population size of crabs in a certain lagoon, traps were laid at random. 400 crabs
were caught, marked and released back into the...
(Solved)
To estimate the population size of crabs in a certain lagoon, traps were laid at random. 400 crabs
were caught, marked and released back into the lagoon. Four days later, traps were laid again and
360 crabs were caught. Out of the 360crabs, 90 were found to have been marked
(i) Calculate the population size of the crabs in the lagoon
(ii) What is the name given to this method of estimating the population size
Date posted:
June 15, 2019
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Answers (1)