Distinguish between acquired and inherited traits by giving one example of each. Why are traits acquired during the lifetime of an individual not inherited?
Distinguish between acquired and inherited traits by giving one example of each. Why are traits acquired during the lifetime of an individual not inherited?
Acquired trait is a particular characteristic that is developed during the lifetime of an individual. Such characteristics are not genetically controlled and cannot be passed on to the next generation.
Example: Loss of weight due to starvation.
Inherited trait is the transmission of particular characteristics from parents to their off springs, generation to generation. Such traits are genetically determined characteristic that distinguishes a person.
Example: Colour of skin.
The acquired traits cannot change the DNA of the germ cells. Therefore, the acquired traits cannot be inherited over generations during the lifetime of an individual.
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Define ‘natural selection’. (b) “Only variations that confer an advantage to an individual organism will survive in a population”. Do you agree with this statement? Give reason for your answer.
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Define ‘speciation’. Explain how speciation occurs. (b) Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Give reason for your answer.
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(a) Explain the terms ‘analogous organs’ and ‘homologous organs’ with examples. (b) In what way are analogous organs evidence for evolution?
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What do you understand by the term ‘evolution’? State Darwin’s theory of evolution.
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Name the scientist who gave the theory of origin of life on earth. What is this theory? (b) How are those species which are now ‘extinct’ studied?
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