Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Bi-Parental Reproduction
In sexually reproducing metazoans, there are separate and distinct male and female individuals. Each has its own reproductive system and produces one kid of sex cell, spermatozoon or egg. Nearly all vertebrates and many invertebrates have separate sexes, and such a condition is celled dioecious and this type of reproduction is called biparental reproduction. However, some animals such as most flatworms, some hydroids, annelids, crustaceans and some fishes have both male and female organs in the same individual. Such a condition is called hermaphroditism. In contrast to the dioecious state of separate sexes, hermaphrodites are monoecious, having both male and female organs in the same organism Most of the hermaphrodites avoid self-fertilization by exchanging germ cells with each other.
For example, although the earthworm bears both male and female organs, its eggs are fertilised by the copulating male and vice versa. Hermaphrodites also prevent self-fertilisation by developing eggs and sperms at different times. If we admit that all living things are mortal, that every living organism is endowed with a life span that must eventually end, then reproduction is indispensable for the continuance of species. During evolution the efficiency of reproduction increased where the parents protect and provide nutrition for the young before or after birth. The adaptations that are found in vertebrates are internal fertilisation, the cleidoic (enclosed in shell) egg, and the foetal membranes. Parallel adaptations are also found in lower animals.
Wound healing and formation of woven bone Stage 1: Wound healing and formation of woven bone (callus) (2 to 6 weeks) The ability of the body to respond to the "trauma" indu
what is welfare in biology
TEMPERATURE Temperature is a major physical environmental factor which profoundly influences the vital activities of living organisms like, metabolism, growth and reproduction.
Question 1: (a) List some differences between a bacteria and a virus? (b) Define‘Swine Flu'. List the main types of ‘Swine Flu' viruses? (c) Describe the preventive measures
Give a detailed description of stereoblastula, please ?#
Explain Potential Health Benefits of Dietary Fibre? A number of experimental studies in animal models, as well as, epidemiological studies have established protective role of d
Explain the Cost Utility Analysis? Cost utility analysis: Cost utility analysis provides for measurement of health outcomes for a given cost. The health outcomes are measured q
Explain the Mechanisms suggested for bile acid adsorption? Mechanisms suggested for bile acid adsorption are: 1. Hydrophobic interactions between lignin and bile acids, 2
Myocardial Protection : To a great extent, the result of cardiac surgery depends on how well the myocardium is protected during cardio pulmonary bypass. Temporary depression of m
Kangroo Rat Kangroo rat Dipodornys merriami, a native of South-West America is a classical example of how small mammals survive in desert. It exhibits all the osmoregulatoryad
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd