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!
Mating and Fertilisation
In all animals sperms are motile and have to move and seek the eggs to fertilise them. For this an aqueous environment is necessary. This need of a liquid medium has led to two basic mating patterns.
1. External fertilisation - mating partners come in close proximity in water and concurrently shed their eggs and sperms in water.
2 Internal fertilisation - mating partners come into physical contact and copulate, in which the male transfers the sperms directly into the reproductive ducts of the female. The ova coming down the ducts obtain fertilized. Internal fertilisation is characteristic of terrestrial animals, but as well occurs in several aquatic forms. Internal fertilisation usually leads to development of an intromittent organ or penis in the male partner. A range of such copulatory organs are found in non-chordates, such as like dates there are spermathecae for storing sperms received during mating. As the eggs pass down the ducts sperms are released from the spermathaca to feitilise them. Honey bee queen mates just one time when it receives enough sperms to fertilise the many thousands of eggs she is going to lay in 4-5 years of reproductive life.
Q.Explain about Stress Testing in Women? Data on mortality in men is about 2.5 times that of women. At younger ages, however, CAD in men exceeds that found in women by 5 to 1.
Which of the following is true for the ATP-sensitive potassium channel? A. The channel is a spanning protein with a receptor site for ATP located on an extracellular region of
Q. Why do ribosomes move along mRNA during translation? During translation the ribosome always exposes two mRNA codons to be translated by moving along the mRNA, when a peptide
Biochemical Changes Many workers have tried to follow the biochemical changes that precede flowering and result in meristems which give rise to flowers instead of vegetative s
Precautions to prevent from HIV To avoid HIV infection one should practice safe sex (use of condoms). Besides a few simple precautions are given for protection against HIV inf
What is the logic of the transfusional compatibility concerning the ABO blood group system? The transfusional compatibility for the ABO system takes into account the antigens s
Rheumatic heart disease was the predisposing cardiac lesion for IE in 20 to 25 per cent. In patients with rheumatic heart disease, endocarditis occurs most frequently on the mitral
What is cytoskeleton? What are its main constituents in animal cells? Ans) Cytoskeleton is the cytoplasmic structure that handles the cell, keeps its shape and fixates and moves
Q. What is the general function of leukocytes? What are leukopenia and leukocytosis? The general function of leukocytes is to participate in the made inside the body or defense
Relate Mitochondria organelles with eukaryotic cells Mitochondria are highly specialised organelles in eukaryotic cells. These perform the energy transducing process, and are o
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