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
Q. Explain Therapy for diarrhoea? The therapy for diarrhoea thus consists of: 1. Determining the status of dehydration 2. Fluid management * Oral Rehydration Therapy (

Explain Direct Microscopic Count - Measurement of Microbes? The most obvious way to determine microbial number is through direct counting under a microscope. In this method, a

how do respiration take place in animal????

Assume you were given a mixture consisting of one molecule each of all possible sequences of a smallish protein of molecular weight 4800 daltons. If the average molecular weight of

Cellular Transport Cellular transports demote to the movement of compounds across the outer wall or membrane of the cell. This transport is critical in two respects. Firstly, t

Sulphur Cycle - Nutrient Cycles The sulphur cycle is mostly sedimentary except for a short gaseous phase. The large reservoir of sulphur is in the soil and sediment where it i


examples on woody perennial Angiosperm species and herbaceous annual angiosperm species. thanks

How is the brain involved in the immune system? A. Immune cells that constitute body's biological defense against infections and toxins, have many things in common with nerve c

Although fructose does not have an aldehyde group it reacts first of allĀ  bonds of fructose was breaked by fehling solution then fructose coverted to aldehydic group then that