CSS Zoology Questions & Answers

Q.  Which of the following facts does not hold truth with reference to De Vries Theory of organic evolution:

a. New species evolve by sudden and distinct heritable changes called by mutations and not by natural selection
b. First individual showing is called "mutant'. It is pure breeding as well as transmits mutations to its progeny and thus starts a new species
c. All organisms have tendency to mutate but the rate of mutation varies from time to time depending upon environmental and physiological conditions
d. The development and deficiency of organs are in proportion to use and disuse of these organs


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