Q59 of 167 Page 210

The presence of which of the following types of organs in two animals indicates that they are not derived from a common ancestor?

Analogous organs

These organs have different origins i.e. they are not derived from common ancestor, but they perform similar functions. For example- Wings of insect and bat.

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57

New species may be formed if:

(i) DNA undergoes significant changes in germ cells


(ii) Chromosome number changes in the gamete


(iii) There is no change in the genetic material


(iv) Mating does not take place

 58

According to the evolutionary theory, formation of a new species is generally due to:

 60

The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor?

 61

One of the following has not been produced from wild cabbage by the process of artificial selection. This one is: