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

What is sustainability, What is sustainability? Sustainability is the a...

What is sustainability? Sustainability is the ability to meet human needsin a way that will allow a human population to survive indefinitely.

Explain pasteurization - method of food preservation, Explain Pasteurizatio...

Explain Pasteurization (temperature below 100° C) - method of food preservation? Pasteurization is a heat treatment that kills a part but not all the microorganisms present and

SCINCE, I WANT JOB FOR TEACHING SCINCE SUBJECT FOR ONLINE

I WANT JOB FOR TEACHING SCINCE SUBJECT FOR ONLINE

Define some essential facts about the fats, Define some Essential facts abo...

Define some Essential facts about the Fats? 1) Fats are essential in diets to facilitate satiety, high-energy intakes, and absorption of fat-soluble vitamins and provide essent

Why capsulate staining is difficult, Why Capsulate Staining is Difficult? ...

Why Capsulate Staining is Difficult? Capsule staining is difficult because capsular material is soluble in water and may be dislodged or removed during vigorous washing. Negati

Calculate the ph - microbial survival and growth, Calculate the pH - microb...

Calculate the pH - microbial survival and growth? Presence of microorganisms also depends on the pH of the medium. Most bacteria grow optimally near neutral pH (optimum 6.5 - 7

Explain the transcription factor of zinc, Explain the Transcription Factor ...

Explain the Transcription Factor of Zinc? Zinc is an important structural component of DNA- binding proteins also known as 'transcription factors'. These transcription factors

Interrupted suture technique-prosthetic aortic valve, Interrupted suture te...

Interrupted suture technique: Synthetic braided 2 '0' sutures (ethibond) with 17mtn needles on either end and a pledget is used. Alternate green and white sutures are taken aft

Codon bias, Codon Bias  is the tendency for an organism or virus to make us...

Codon Bias  is the tendency for an organism or virus to make use of certain codons more than the others to encode a particular amino acid. A significant detrminant of codon bias is

Intracellular digestion, Intracellular Digestion We all know that unic...

Intracellular Digestion We all know that unicellular organisms do not have a separate alimentary canal system. All the functions of life are carried out inside a single cell.

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