CSS :: Variations and Mutations
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21. |
Who demonstrated development of important variations in mice reared at 5?C and 21?C: |
A. |
Darwin and Walliace |
B. |
Tower and Agar |
C. |
Huxley and Muller |
D. |
Bateson and Punett |
Answer: Option B
Explanation:
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22. |
Change in gene pattern bringing about variations may be due to: |
A. |
Random distribution of homologous genes in meiosis |
B. |
Phenomenon of crossing over |
C. |
Random union of gametes in fertilization |
D. |
All of these |
Answer: Option D
Explanation:
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23. |
If all the organisms would have inherited same genotype there would have been: |
A. |
No evolution |
B. |
Better evolution |
C. |
Special type of evolution |
D. |
Something else |
Answer: Option A
Explanation:
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24. |
Difference in somatogenic and blastogenic variations is that: |
A. |
Former mayor may not be inherited but later are always inherited |
B. |
Former are not inherited but later may be inherited |
C. |
Both are inherited compulsorily |
D. |
Both are not inherited |
Answer: Option A
Explanation:
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25. |
Who considered variations as characters acquired by the organisms during their life-time: |
A. |
Darwin |
B. |
De Vries |
C. |
Dodson |
D. |
Lamarck |
Answer: Option D
Explanation:
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26. |
Sudden changes in characteristics of organism due to chemical changes in their genetic materials are called: |
A. |
Variations |
B. |
Mutations |
C. |
Both (a) & (b) |
D. |
None of these |
Answer: Option B
Explanation:
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27. |
Mutations were also called "Sports" by: |
A. |
Oparin |
B. |
Lamarck |
C. |
Darwin |
D. |
None of them |
Answer: Option C
Explanation:
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28. |
The term "Saltatory or Discontinuous Variations" was used by Bateson for: |
A. |
Somatogenic changes occurring in organism during lifetime |
B. |
Sudden changes in the characteristics of organisms due to chemical changes in their genetic material |
C. |
Random union of gametes in fertilization |
D. |
Random distribution of homologous genes in meiosis |
Answer: Option B
Explanation:
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29. |
"Gene Point Mutations" are: |
A. |
Changes in nucleotide sequence of DNA molecule usually at a single place affecting single gene |
B. |
Changes in chramosome effecting a number of genes simultaneously |
C. |
Alteration in number of chromosomes |
D. |
None of these |
Answer: Option A
Explanation:
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30. |
Mutations occur during process of gametogenesis due to errors in chromosome duplication and crossing over by: |
A. |
Deletion process |
B. |
Translocation process |
C. |
Inversion process |
D. |
All of these processes |
Answer: Option D
Explanation:
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