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CSS :: Variations and Mutations


11.  Continuous variations are small variations from one extreme to the other which are always found amongst members on a same species like variations in shape, colour size, weight etc. These were considered heritable and 'raw materials' for evolution by:
A. Mendel B. Charles Lyell
C. Charles Darwin D. All of these

12.  Ordinarily the continuous variations are considered:
A. Heritable B. Non-heritable
C. Heritable or non-heritable D. None of these

13.  Discontinuous variations are:
A. Sudden and non-heritable B. Sudden and heritable
C. Grandual and heritable D. Gradual and non-heritable

14.  Quantitative discontinuous variations are positive when:
A. The number of some variant part is normal B. The number of some variant part is more than normal
C. The number of some variant part is less than normal D. The number of some variant part is unaffected

15.  Which of the following is not the example of positive quantitative variations:
A. Six arm in starfish B. 14 pairs of ribs in man
C. Presence of six fingers in man D. Presence of two ear pinnae in man

16.  Ancon sheep of Sethwright's Farm in Massachusetts (America) is example of:
A. Somatogenic variation B. Substantive discontinuous variation
C. Continuous variation D. All of these

17.  Presence of only four digits in hand will be an example of:
A. Negative quantitative discontinuousvariations B. Positive quantitative discontinuous variations
C. Positive quantitative continuous variations D. Negative quantitative continuous variations

18.  Determinate variations are:
A. Continuous variations B. Somatogenic variations
C. Adaptive and selective variations of definite evolutionary lines D. None of these

19.  Determinate variations are also called:
A. Continuous variations B. Orthogenic variations
C. Both (a) & (b) D. None of these

20.  Determinate variations are controlled by strong genes or their recombination which are often so strong that the characters continue to develop beyond usefulness, to bearer and ultimately bring extinction of the species. The example of such are:
A. Antlers of Irish Elks B. Teeth of Swedolon
C. Both (a) & (b) D. None of these




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