Question

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

• A. (i) and (ii)
• B. (i) and (iii)
• C. (ii), (iii) and (iv)
• D. (i), (ii) and (iii)

Answer 1

The correct option is A

(i) and (ii)

The correct option is A.

Explanation for the correct option:

Option A:

1. Evolution will only take place when there is change and variation in the genetic material.
2. Hence, a variation in genetic material and variation in chromosomes is required for the evolution of new species.
3. New species may be formed if DNA undergoes a significant change in germ cells.
4. Variations in DNA sequences will be inherited by the germ cells.
5. Germ cells that when passed to the next generation will be inherited by the progeny.
6. Change in the chromosome number makes a change in the gametes which leads to change in the gene pool and causes variation.

Final answer: New species may be formed if DNA undergoes significant changes in germ cells and also if chromosome number changes in the gamete.