Q1 of 26 Page 284

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

The organs that have different internal structure but same appearance and also perform similar function to survive the prevailing environment are known as analogous organs. They do not share common ancestors and have different origin. They evolve independently of each other.

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1

If the fossil of an organism is found in the deeper layers of earth, then we can predict that:

 1

New species may be formed if:

i. DNA undergoes significant changes in germ cells


ii. There is no change in the genetic material


iii. Change in number of chromosomes


iv. Mating does not take place

 2

Define sex determination.

 2

What are the mechanisms or methods of sex determination in different organisms?