How do Mendel’s experiments show that traits may be dominant or recessive? (b) How do Mendel’s experiments show that traits are inherited independently?
(a) How do Mendel’s experiments show that traits may be dominant or recessive?
(b) How do Mendel’s experiments show that traits are inherited independently?
(a) Mendel first crossed pure bred tall pea plants with pure bred dwarf pea plants and found that only tall pea plants were produced in the first generation. No dwarf pea plants were obtained in F1 generation. Mendel concluded that the first generation showed the traits of only one of the parent plants; tallness. The trait of other parent plant, dwarfness, did not show up in the progeny of first generation. Mendel then crossed the tall pea plants of the first generation (F1 Generation) and found that tall plants and dwarf plants were obtained in the second generation (or F2 generation) in the ratio of 3:1. Mendel noted that the dwarf trait of the parent pea plant which had seemingly disappeared in the first generation progeny reappeared in the second generation. In this way, Mendel’s experiments with tall and dwarf pea plants showed that the traits may be dominant and recessive.
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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.
4 years ago
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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.
4 years ago
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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?
4 years ago
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What do you understand by the term ‘evolution’? State Darwin’s theory of evolution.
4 years ago
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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?
4 years ago
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