Question

Offsprings may vary in characters from their parents.

a) What are reasons of this variation in the light of genetics?

b) How does the changes take place during meiosis cause variations in next generation?

c) How does the chemical substances and the radiations cause variation in characters?

Answer 1

a) Crossing over and mutations. 

b) When a part of a particular DNA become the part of another DNA, the sequencing of nucleotides in the DNA become differs and hence variation may occur in the offsprings. 

c) Mutation may occur due to chemicals and radiations.