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
CONCEPT OF NURSING UNIT: Concept in the design and facilities of nursing unit has been changed time to time based on the different categories of patients and peculiarities of

Why in some cases is mitosis a synonym of reproduction? In some living beings asexual reproduction happens by many means: binary division, schizogony, budding, grafting, etc. I

Overgrazing - Degradation of Ecosystem It refers to the condition when the grazing pressure on the vegetation is so intense that it does not recover. Ultimately, there is a lo

Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to ph

Corpus Allatum and Prothoracic Gland Corpus Allatum The corpus allatum is situated in the neck region of insects. It is generally a rounded, solid and translucent struc

Explain carbohydrates requirement during thyphoid Carbohydrates: Carbohydrate intake should be liberal. This can be attributed  to: 1.  Repletion of glycogen stores. 2.

What is reflexive memory? Reflexive memory relies on the cerebellum and amygdala. Compare among aerobic respiration and anaerobic respiration. Aerobic respiration happens in th

Q. Nutritional Management Goals for atherosclerosis? The nutritional management goals include: • Reduction of weight if overweight or obese • Reduction in the intake of

Admission to  the Hospital The  philosophy of  childcare, whether in the home, hospital, or  other community agency, should be consistently one of concern and support for the

Explain the Bioavailability of Folate? Bioavailability of folate from naturally occurring food sources is variable and frequently incomplete, as mentioned earlier in the food