Head - structure of the sperm, Biology

Assignment Help:

Head - Structure of the Sperm

It exhibits a diversity of shapes in different animal groups, e.g., spherical (teleost fishes), rod or lance shaped (amphibians), spirally twisted like a corkscrew (birds), spoon shaped (man), flattened (buffalo) or hooked (mouse and rat) or occasionally round (bivalve molluscs). Some of these shapes may be interpreted as an adaptation to propulsion in fluid media. The genetic functions are embodied in the nucleus; activation of egg during fertilization is basically initiated by anterior cap like acrosome. The nucleus occupies the greater part of head and it also determines the shape of head. During the course of sperm differentiation (spermiogenesis), everything in the nucleus not directly concerned with the transmission of heredity characters is discarded leaving only the actual material of genes (DNA) which is tightly packed within the nucleus.


Related Discussions:- Head - structure of the sperm

Conditions associated with increased need for vitamin a, Define Conditions ...

Define Conditions associated with increased need for Vitamin A? Conditions and populations associated with increased need for vitamin A includes young children  particularly  t

What is polyembryony, What is polyembryony? Polyembryony is the phenome...

What is polyembryony? Polyembryony is the phenomenon in which a single embryo in its initial embryonic stage separates itself forming many new individuals of the similar sex an

Describe pericardial rub and their characteristic, Describe Pericardial Rub...

Describe Pericardial Rub and their Characteristic ? Generation of sound: The sound is generated due to rubbing of visceral and parietal pericardial surfaces against each other

Pituitary, Pituitary The pituitary is also known as hypophysis. It is ...

Pituitary The pituitary is also known as hypophysis. It is composed of two embryologically distinct tissue. The anterior pituitary or adenohypophysis is derived from the roof

Living beings are made of organic and inorganic substances, Living beings a...

Living beings are made of organic and inorganic substances. According to the complexity of their molecules how can each of those substances be classified? Inorganic substances

Conjugation – protozoan, Conjugation – Protozoan Conjugation is charac...

Conjugation – Protozoan Conjugation is characteristic of ciliates. The details vary from species to species. The general features can be observed in Paramecium sps. which has

Explain the principles of taxonomy, Explain the Principles of Taxonomy? ...

Explain the Principles of Taxonomy? The goal of taxonomy is to develop a workable classification that reflects evolutionary relationships and provides identification and no

What is the endocrine function of the placenta, Q. What is the endocrine fu...

Q. What is the endocrine function of the placenta? The placenta besides being the organ through which the exchange of substances between the fetus and the mother is done also h

How does hypophysis- corpus luteum negative feedback work, Q. How does the ...

Q. How does the hypophysis- corpus luteum negative feedback work? What is the name given to the atrophied corpus luteum after this feedback process? After ovulation the estroge

What are zoonotic diseases, Q. What are Zoonotic Diseases? The World He...

Q. What are Zoonotic Diseases? The World Health Organization defines Zoonoses (Zoonosis, sing.) as "Those diseases and infections, which are naturally transmitted between verte

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