Syngamy - patterns of sexual reproduction, Biology

Syngamy - Patterns of Sexual Reproduction

Sperm fuses with the egg. This results in both the union of the paternal nucleus with the maternal one (karyogamy), as well as the fusion of the cytoplasms of the two gametes (plasmogamy). Syngamy leads to fertilisation producing a zygote which develops into new individuals, depending upon the size and shape of the gametes involved, syngamy can be subdivided into three types.

i) Isogamy: The gametes are morphologically similar although they may differ in their physiological and biochemical properties. For example, the gametes produced from the male and female gametocytes of Monocystis.

ii) Anisogamy: The gametes differ in size and structure and are collectively known as anisogametes. Of these, the smaller ones are usually more numerous and motile. They are called the male gametes (or the micro-gametes as in protozoans and the sperms as in metazoans). The fusion of micro - and macro-gametes is known as anisogamy. It is frequently found in protozoans as in Plasmodium and Vorticella. In higher phyla the term fertilisation is used instead of anisogamy.

iii) Oogamy: In oogamy one gametes type is always motile and usually small (the sperm) and the other is always nonmotile and large (the egg). All metazoans exhibit oogamy. The eggs of most fully terrestrial non-chordates such as insects have shelled eggs. The shell bears a minute pore (micropyle) for allowing the entry of sperms for fertilization.

Posted Date: 2/5/2013 1:02:56 AM | Location : United States







Related Discussions:- Syngamy - patterns of sexual reproduction, Assignment Help, Ask Question on Syngamy - patterns of sexual reproduction, Get Answer, Expert's Help, Syngamy - patterns of sexual reproduction Discussions

Write discussion on Syngamy - patterns of sexual reproduction
Your posts are moderated
Related Questions
Distinguish between epithelial and connective tissues with respect to their cell arrangement? PROVIDE a specific example (for both tissue types) of how the arrangement of cells hel

Ketosis Ketosis, also known as acetonaemia or ketonaemia is a multifactorial disorder that commonly occurs in dairy cows and buffaloes immediately after calving or in early lac

Define the Food System in space? Mercury (1961-1963) astronauts had to eat bite-sized cubes, freeze dried powders, and semi liquids stuffed in aluminium tubes. For most asbonau

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

I have no idea how to do this: two gene loci, A and B, assort independently, and alleles A and B are dominant over alleles a and b. Indicate the probability of producing: an AB phe

Define the Vitamin and Minerals required for elderly? Decreased gastric secretion and intestinal motility affect the absorption and intake of nutrients especially calcium, iron

Determine the Symptoms of Dehydration? The symptoms of dehydration are: Thirst Loss of appetite Decreased urination Impaired physical performance Nau

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Define Criteria for Assessment of Vitamin D Status? You may recall the events involved in calcium homeostasis described earlier in this section. We studied that sufficient 25-O

Is it possible for any son of a couple formed by a hemophilic man (XhY) and a nonhemophilic noncarrier (XX) woman to be hemophilic? If the mothers are not affected by the disea