what are disadvantages of sexual and asexual reproduction

 Disadvantages of asexual reproduction:

1. No genetic variation
2. Offspring produced may become extinct due to unfavorable conditions
3. Some methods of asexual reproduction produce offspring that compete with each other for food and space.

Disadvantages of sexual reproduction:

1. Energy expenditure is comparatively more
2. Genetic recombination is counter-productive, if conditions are stable
3. Slow process
4. Lesser number of progeny can be produced at a time