Which two of the following statements about genetic variation are correct?
1 Asexual reproduction always produces genetic variation.
2 Gamete production is the only possible source of genetic variation in sexual reproduction.
3 The environment can cause genetic variation.
4 Mutations can produce genetic variation.

Answer:

1) F

Asexual reproduction does not produce genetic variation
In sexual reproduction, gamete production is not the only possible source of genetic variation. Genetic variation arises from fertilisation too.
Environment and mutations cause genetic variation. So statements 3 and 4 are correct.