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
Answer: Option C
Explanation:
12.
Ordinarily the continuous variations are considered:
A.
Heritable
B.
Non-heritable
C.
Heritable or non-heritable
D.
None of these
Answer: Option C
Explanation:
13.
Discontinuous variations are:
A.
Sudden and non-heritable
B.
Sudden and heritable
C.
Grandual and heritable
D.
Gradual and non-heritable
Answer: Option B
Explanation:
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
Answer: Option B
Explanation:
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
Answer: Option D
Explanation:
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
Answer: Option B
Explanation:
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
Answer: Option A
Explanation:
18.
Determinate variations are:
A.
Continuous variations
B.
Somatogenic variations
C.
Adaptive and selective variations of definite evolutionary lines
D.
None of these
Answer: Option C
Explanation:
19.
Determinate variations are also called:
A.
Continuous variations
B.
Orthogenic variations
C.
Both (a) & (b)
D.
None of these
Answer: Option B
Explanation:
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
Answer: Option C
Explanation:
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