Mating and fertilisation, Biology

Assignment Help:

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.


Related Discussions:- Mating and fertilisation

Similarities and differences between the two species, Compare the teeth of ...

Compare the teeth of Australopithecus afaensis and Homo sapiens. a)Describe the similarities and differences between the two species. b) Write a hypothesis about dietary difference

Congenital anomalies of small and large intestines, Congenital Anomalies of...

Congenital Anomalies of Small and Large Intestines: 1) Intussusecption  Intussusecption  is the invagination or telescoping  of one part of  the intestine into another part

Hutchinson phyletic dieta, hi there,i would like u to help me with understa...

hi there,i would like u to help me with understanding Hutchinson phyletic dieta

Describe ps with vsd in tetralogy of fallot''s, Describe PS with VSD in Tet...

Describe PS with VSD in Tetralogy of Fallot's ? This group is also known as Tetralogy of Fallot's physiology. The classic example is Fallot's tetralogy characterized by: (1) Se

Define the disc electrophoresis, Define the Disc Electrophoresis? Disc ...

Define the Disc Electrophoresis? Disc electrophoresis has improved resolution and strong bands are obtained. It requires a two-gel system and several different buffers. The run

Disease prevention for the high risk group, Disease Prevention for the High...

Disease Prevention for the High Risk Group   Interventions aimed at early diagnosis and appropriate management for reducing morbidity and mortality targeting people who suffer

Define common complications with spinal trauma patients, Define Common comp...

Define Common complications with spinal trauma patients? Common complications with spinal trauma patients include pressure sores or decubitus ulcers, hypercalciuria and renal s

What is portal and rental circulation, What is Portal and Rental Circulatio...

What is Portal and Rental Circulation ? The body has other circulation systems that do not return blood directly to the heart. For instance, the blood that drains from the abdo

Disorders of thyroid function, Disorders of Thyroid Function: The diso...

Disorders of Thyroid Function: The disorders of thyroid function may  lead to following problems:  Juvenile Hypothyroidism Hypothyroidism is one of the most common end

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd