Hermaphroditism, Biology

Hermaphroditism

You would have completely appreciated now that sexual reproduction is definitely the more advanced type of reproduction. It gives for combination of genes from different genetic stocks and imparts the potentiality of better adaptation to the environment and evolution. The involved sex cells (gametes) that are the eggs and sperms come from different individuals that are the female and the male. Species having separate sexes are called dioecious such species are as well called unisexual - composed of individuals of any one sex. But a dissimilar condition pervails in many non-chordates in which both types of organs (testes and ovaries) are found in similar individual. This condition is called bisexualism or more popularly Hermaphroditism and such types of individuals are termed monoecious. The term hermaphrodite comes from Greek mythology where Hermaphroditos the son of Hermes and Aphrodite possessed both female and male sex characters. Hermaphroditism is common in non-chordate groups. In the several incipient forms we can see it even in the ciliate protozoans such as Paramecium. From the account of conjugation of Paramecium, it is clear that it has both a male and a female pronucleus. So each Paramecium serves as a male and a female. In Paramecium during Autogamy, similar micro-nuclear changes as seen during conjugation take place in the single individual. But here like there is no second individual involved, it is comparable to self-fertilisation. Among Metazoa, Hermaphroditism is the rule in flatworms, (Platyhelminthes), pulmonate among gastropods, earthworms and leeches (Annelida) etc. additionally, Hermaphroditism occurs among other animals also, as in some bivalve molluscs.

Posted Date: 2/5/2013 1:28:25 AM | Location : United States







Related Discussions:- Hermaphroditism, Assignment Help, Ask Question on Hermaphroditism, Get Answer, Expert's Help, Hermaphroditism Discussions

Write discussion on Hermaphroditism
Your posts are moderated
Related Questions
Circulation of nutrients in the coastal zone Circulation of nutrients from the sea bottom to the upper surface, occurs in the coastal regions by two processes Upwelling

Mitochondria, which fuel life's processes in all cells, uses nutrients from digested food and oxygen which has diffused across cell surface. In freshwater protozoans water expulsio

What are age pyramids? Age pyramids are graphical representations in form of superposed rectangles every representing the number of individuals contained in age ranges into whi

Sonology : This is the study of hearing. Sonology is a type of science of neologism which is used to describe the study of sound in a variety of disciplines. In medicine, this term

The fundamental contractile unit is the sarcomere. Each muscle cell apart from the nucleus, mitochondria and other structures contains parallel fibrils. Sarcomere is a subunit of t

Is fecundation in amphibians external or internal? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles? In the majority of the amphibian species fec


Discuss about electric field The electric field is a vector quantity whose magnitude is the force per unit charge and points in the direction of the force on the positive test

Chronic Aortic Regurgitation :  Several factors have to be taken into account before recommending surgery. These include severity of symptoms and LV function. With evidence o

Q. What are the sources of dietary fibre in our diet? The sources of dietary fibre include whole grain cereals, legumes, whole pulses, leafy vegetables, vegetables like peas,