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
Explain Technical factors influencing food production? Improvement in technology has a significant impact on productivity. Improvements may occur in seed production, fertilizer

How Phosphorus in Blood is presented? Phosphorus in Blood is Present as: 1.  Inorganic phosphorus in the form of HPO 4 or H 2 PO 4 2.  Organic or ester phosphorus such

Plasmid  is the class of the circular, extrachromosomal, autonomously replicating, DNA elements found in number of bacteria. Contain origins of the replication to ensure their main

What is the nucleolus? The nucleolus is a small and optically dense region in the interior of the cell nucleus. It is made of ribosomic RNA (rRNA) and proteins. Single nucleus

Explain functional properties of gellan gums One of the most important features of gellan gums is its versatile texture which is defined in terms of hardness (measure of ruptur

What is Leaf Morphology? Leaf Arrangement : These show the different types of leaf arrangement on a twig. The point on the twig at which the leaves are attached is refer

How many progeny flies are expected to have full wings and gray bodies?

Production of substances interfering with virus proliferation In some cases plants are known to synthesise chemicals that inhibit crucial functions of pathogens. This makes pl

Ask question #Minimum 100 hhejejhjehjwords accepted#

In this unit, you have learnt that heart is a muscular organ situated in thorax covering with pericardium and consist of four chambers i.e. right atrium, left atrium, right ventric