Question

What do you mean by alteration of generation ? Explain.

Answer 1

Alteration of generation is the pattern of reproduction occuring in the life cycles. The generations are generally sexual and asexual. these may occur between two distinct forms.
OR
The occurrence of two or more forms differently produced in the life cycle of a plant it animal usually involving the regular alternation of sexual or asexual generation but not infrequently consisting of alternative parthenogenetic generation

Answer 2

the occurance of two or more forms differently produced in the life cycle of a plant or animal usually involving the regular alternation of a sexual with an asexual generation, but not infrequently consisting of alternation of a dioecious generation with one or more pathogenic generation.