Ovipary, vivipary and ovovivipary, Biology

Ovipary, Vivipary and Ovovivipary

In each case of external and in some cases of internal fertilisation, development of the fertilized egg (zygote) occurs outside the mother's body. The egg is laid either in water or in soil, on plants, or in the body of their hosts in case of specific parasites. Ail such animals or called oviparous (laying eggs). A number of exceptional cases of non-chordates showing, vivipary that is giving birth to young ones nourished by the genital tracts of the female, are found in some insects like tsetse fly (Glossina). A third condition is that of Ovovivipary. In this case, after fertilisation the zygote is retained in the female reproductive system with no any direct connection with the maternal tissues for providing nourishment. Here it undergoes development. Finally the eggs hatch still inside the female and the young ones are "born". This happens for instance in certain flies.

Posted Date: 2/5/2013 1:22:54 AM | Location : United States







Related Discussions:- Ovipary, vivipary and ovovivipary, Assignment Help, Ask Question on Ovipary, vivipary and ovovivipary, Get Answer, Expert's Help, Ovipary, vivipary and ovovivipary Discussions

Write discussion on Ovipary, vivipary and ovovivipary
Your posts are moderated
Related Questions
Which of the following serves as a sensor, or as part of a sensor, that functions in a negative feedback system? A. CaSRs (Calcium-Sensing Receptors) located in the plasma memb

Q. Explain Clostriduim botulinum? Clostriduim botulinum is widely distributed in soil and marine sediments throughout the. world. It is also found in the intestinal tract of a

What are the differences between astral and anastral mitosis? Astral mitosis is that in which there is structure of the aster, a structure made by the centrioles. Anastral mito

Q Why after the passage of animals from the aquatic to the terrestrial habitat does the abandonment of the ammoniotelic excretion occur? Ammonia is a highly toxic molecule if n

What is Class Chondrichthyes? Class Chondrichthyes takes its name from two Greek words. "Chondros"; means cartilage, and "ichthys"; refers to fish, therefore the name "cartilag

what carbohydrates does a plant make from glucose

Q. Management of Symptomatic Patients All symptomatic patients with severe aortic stenosis or even moderately severe aortic stenosis should undergo aortic valve replacement an

Determine the Signs and Symptoms of Bulimia? 1. Binges, minimum twice a week for three months 2. Purging a Menstrual irregularities 3. Swollen glands Frequent fluct

What is the chemical equation of photosynthesis? The chemical equation of photosynthesis is the following: 6 CO 2 + 6 H 2 O + light --> C 6 H 12 O 6 + 6 O 2

what is nuclus