Errors in fertilization, Biology

Assignment Help:

ERRORS IN FERTILIZATION -

1.       Polyspermy - When more than one sperms are fused in an ovum, this condition is called polyspermy.

2.       Polygynae - During oogenesis after the meiosis polar body I and II are not seperate, in this condition one male pronuclei fused to two female pronuclei. This condition is called polygynae.

3.      Polyandry - When two male pronuclei fused with the one female pronuclei is called as polyandry, in this condition embryo is dead.

4.      Gynogenesis - When sperm contact to the ova than ova is activated but pronuclei of sperm not fused to female pronuclei.

5.      Partial fertilization - In this type of fertilization pronuclei of sperm fertilized to a blastomere.

6.    Androgenesis - During fertilization process, pronuclei of ova if inactivated, during development process pronuclei of sperm participate.


Related Discussions:- Errors in fertilization

Structure of human spermatozoon, Structure of human spermatozoon: Na...

Structure of human spermatozoon: Nature: Human sperms are minute, microscopic and motile. Structure: Each sperm have an oval shaped head piece, a neck, a middle piece and

Non-succulent perennials, Non-succulent perennials These are actually t...

Non-succulent perennials These are actually the true xerophytes or drought resistants, because they possess a number of morphological, anatomical and physiological characterist

Etiological factor of gastritis, Q. Etiological factor of gastritis? So...

Q. Etiological factor of gastritis? Some most frequently associated risk factors for gastritis include: • Faulty dietary habits like overeating and taking highly seasoned fo

Enumerate the absolute and relative contraindications, Enumerate the absolu...

Enumerate the absolute and relative contraindications. 1. Absolute contraindications - Recent myocardial infarction - Valvular prosthesis - Severe renal disea

Functions of insulin, FUNCTION S - (a) It is antagonistic to glucagon....

FUNCTION S - (a) It is antagonistic to glucagon. Insulin decreases the level of glucose in the blood. It acts by increasing the rate at which glucose is transported out of the

Define the term - microfilaments and microtubules, Define the term - microf...

Define the term - microfilaments and microtubules The cytoskeleton is, in fact, termed as the "bone and muscle" of the eukaryotic cell, and is composed of a network, consisting

Explain zymogen, Zymogen :- an  inactive form of an  enzyme; becomes active...

Zymogen :- an  inactive form of an  enzyme; becomes active prior to its action.

Define conjugation in brief, Define Conjugation in brief. A form of se...

Define Conjugation in brief. A form of sexual reproduction in ciliates (Ciliophora). During conjugation two ciliate protozoans join and macronuclei disappears. After meiotic d

Sporotrichosis, Sporotrichosis Sporotrichosis is subacute or chronic i...

Sporotrichosis Sporotrichosis is subacute or chronic infectious disease caused by a dimorphic fungus, Sporothrix schenkii which occurs commonly in soil, wood and vegetation. T

Explain the concepts of food chain and food web, What is the difference bet...

What is the difference between the concepts of food chain and food web? The chain method is a theoretical model to study the energy flux in ecosystems. Actually in an ecosystem

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