Inter specific incompatibility, Biology

Assignment Help:

Inter specific Incompatibility

This type of incompatibility is characterized by the prevention of fusion of gametes between members of different species. The incompatibility factors also operate after fertilization and cause eventual breakdown and failure of embryo development. The factors that prevent seed set following inter specific crosses have not been worked out. It is however apparent that rejection reaction may operate at any level. In Petunia the morphological abnormalities of the pollen tube are similar in both self and inter-generic incompatibility.

The inhibition may result from unilateral incompatibility, or incongruity or a passive rejection may operate. Inter specific incompatibility involves non-proteinaceous substances besides the stigma surface proteins. Phenolics and carbohydrates also seem to play an important role. It is believed that more than one gene at different loci controls the inter specific incompatibility. In crosses between incompatible species either fertilisation does not occur or the hybrid embryo aborts due to either inadequate development of endosperm or lack of support from endosperm.


Related Discussions:- Inter specific incompatibility

Physical state of protoplasm, PHYSICAL STATE OF PROTOPLASM Several theo...

PHYSICAL STATE OF PROTOPLASM Several theories have been given about its physical structure - (i )  Granular Theory (Proposed by Altman, Hanstein, 1886) - Granules embed

What are the main classes into which the phylum is divided, What are the ma...

What are the main classes into which the phylum is divided? What are some examples of each and in which form (polyp or medusae) are they found? Coelenterates are separated into

How depolarization of the neuronal plasma membrane generated, How is the de...

How is the depolarization of the neuronal plasma membrane generated? How does the cell return to its original rest? When the neuron receives a stimulus by the binding of neurot

Explain sound production - ethological approach in taxonomy, Explain Sound ...

Explain Sound production - Ethological Approach in Taxonomy The most used, ethological feature in identification is the sound produced by various species of animals. This is

Phylum Coelenterata, What are the classes in Phylum coelenterata?

What are the classes in Phylum coelenterata?

What do you mean by hypertension, Q. What do you mean by Hypertension? ...

Q. What do you mean by Hypertension? Hypertension is one of the major risk factors for cardiovascular disease. It is the most common public health problem and often referred to

Explain about the classification of fungi, Explain about the Classification...

Explain about the Classification of Fungi? The fungi, as you may recall reading above, is now placed in a separate kingdom called Myceteae. Traditionally, fungi were divided in

Define causes of iron deficiency anaemia, Define Causes of iron Deficiency ...

Define Causes of iron Deficiency Anaemia? Anaemia is a condition in which the blood cannot carry enough oxygen. This may be because there are fewer red blood cells than normal,

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