Distinguish between prenatal and postnatal growth.
Distinguish between prenatal and postnatal growth.
The term ‘reproduction’ is used for the process in which an offspring is produced from their parents. The phenomena of reproduction is essential for continuity of species from generation to generation. The reproduction can be of the two types: sexual and asexual. In the asexual reproduction, the offspring is produced only by a single parent. It usually occurs in single celled organisms and some plants. The sexual reproduction on the other hand, involves fusion of gametes from both sexes, male and female, to form an offspring.
The humans reproduce by the sexual method of reproduction which involves fusion of gametes from both sexes, male and female, to form an offspring. The male gametes are called as the sperms while the female gametes are called as the eggs or ovum. Both sperm and eggs are produced by meiotic cells division so that the resulting gamete cells are haploid, which then fertilize together to form a diploid zygote. The zygote further divides to form an embryo which subsequently grows and divides to give rise to the human offspring.
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