Agricultural Science, JSS 2, Week 5
Topic: Animal reproduction
Contents:
- Meaning of Animal Production
- Meaning of Asexual Production
Meaning of Animal production
It is the process by which living organisms duplicate themselves. Animals compete with other individuals in the environment to maintain themselves for a period of time sufficient to enable them to produce tissue essential to their own survival.
This article describes the reproductive systems in metazoans (multicelled animals) from sponges to mammals, exclusive of humans.
It focuses on the gonads (sex organs), associated ducts and glands, and adaptations that aid in the union of gametes i.e., reproductive cells, male or female, that are capable of producing a new individual by union with a gamete of the opposite sex.
Unlike most other organ systems, the reproductive systems of higher animals have not generally become more complex than those of lower forms.
Asexual reproduction (i.e., reproduction not involving the union of gametes), however, occurs only in the invertebrates, in which it is common, occurring in animals as highly evolved as the sea squirts, which are closely related to the vertebrates.
It is a mode of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it is reproduction which almost never involves reproduction without the fusion of gametes. Asexual reproduction is the primary form of of reproduction
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