1. Isogamy is matched with involves organisms with gametes of the same size and shape
Isogamy refers to a form of fertilization involving gametes with the same morphology, so that they can not be classified as male or female. Isogamy occurs in various unicellular organisms, in many fungi and algae. His antonym is anisogamy.
It seems likely that sexual reproduction appeared in the form of isogamous reproduction. Today, isogamy is a rare phenomenon, even in unicellular organisms.
2. Anisogamy is matched with involves organisms with gametes of different sizes and shapes.
Anisogamy is a form of fertilization in which the male and female gametes are both mobile but of different size and morphology. His antonym is isogamy.
In general, female gametes are larger, richer in reserves, less motile and less abundant than male gametes. These differences are considered to be at the origin of sexual selection, which in turn is responsible for secondary sexual characteristics or sexual dimorphism.
3. Oogamy is matched with involves organisms with gametes of the same shape but different sizes.
Oogamy consists of the fusion of an immobile oosphere with a small and mobile male gamete. It is therefore a fertilization in which the female gamete is motionless while the male gamete is flogged.
Oogamy is a type of anisogamy very clear where the female gamete is motionless, bulky, rich in reserves necessary for the development of the embryo, and where the male gamete is small, lacking reserves, mobile or not.
4. Gonads is matched with gamete-producing organs in animals.
A gonad is an animal organ intended for reproduction (a reproductive organ). The gonads go in pairs; these are the testes in the male and the ovaries in the female; they play an important role in the reproductive system, since it is at the level of these organs that are produced reproductive cells that is to say the gametes:
* males: spermatozoa, by the testicles;
* females: ovules, by the ovaries.
5. Gametangia is matched with gamete-producing organs in lower plants.
A gametange is a plant structure that produces and contains gametes. Gametanges are found only in the Archégoniates (ferns, mosses, angiosperms and gymnosperms).
Gametange consists of one or more sterile cell layers (sterile tissue) protecting the mother cells from spores (fertile tissue).
* The male gametange is called antheridia.
* The female gametange is the archegon.
