Write two points of difference between asexual and sexual types of reproduction. Describe why variations are observed in the offspring formed by sexual reproduction.
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| Asexual reproduction | Sexual reproduction |
| (a) Involves only one parent
(b) Gametes are not produced (c) No fertilization and zygote formation (d) Meiosis does not occur at any time during reproduction |
(i) Often involves two parents
(ii) Gametes are produced (iii)Fertilisation and zygote formation is observed. (iv) Meiosis occurs at the time of gamete formation |
During sexual reproduction two types of gametes fuse. Although the gametes contain the same number of chromosomes, their DNA is not identical. This situation generates variations among the offsprings.
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| Sexual reproduction | Asexual reproduction |
| Two parents are involved | Single parent is involved |
| Gametes are formed | Gametes are not formed |
In sexual reproduction we can find more variations when compared to asexual mode of reproduction.
Following are the reasons for that
- Gene pool are contributed by two parents
- Crossing over that occur during meiosis results in more variation
- DNA replication also contributes for the variation