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प्रश्न
Short answer question.
What is disruptive selection?
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उत्तर
Disruptive natural selection is a selection in which more number of individuals acquire peripheral character value at both ends of the distribution curve.
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संबंधित प्रश्न
With the help of suitable examples, explain why certain traits cannot be passed on to the next generation. What are such traits called?
Give the respective scientific terms used for studying the mechanism by which variations are created and inherited
Give the respective scientific terms used for studying the development of new type of organisms from the existing ones.
Some plants occur in one of the two sizes : tall or dwarf. This characteristic is controlled by one pair of genes. Tallness is dominant to dwarfness. Choose suitable letters for this gene pair.
A black mouse mates with a brown mouse, and all the offsprings are black.
(a) Why are no brown offsprings produced?
(b) If two of the black offsprings mate with each other what kind of offspring would you expect and in what proportions? Give reason for your answer.
Match the terms given in column I with those given in column II :
| Column I | Column II |
| (1) Fossil | (a) A famous evolutionist |
| (2) A theory of evolution | (b) Survival of the fittest |
| (3) Probable ancestor of birds | (c) Petrified remains of prehistoric life |
| (4) Charles Darwin | (d) Father of genetics |
| (5) Gregor Mendel | (e) Archaeopteryx |
A gradual change, over a long period, in a form of life is known as :
(a) erosion
(b) evolution
(c) revolution
(d) evaluation
Out of the wing of a bird, wing of an insect and the wing of a bat :
which two are analogous organs?
Define the Gene frequency.
Which fossil animal is considered as the connecting link between reptiles and birds? Give any one character of each class found in it.
