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 do you mean by high level of behavioral sophistication, Q What are the...

Q What are the few examples of beings of the phylum Arthropoda that present a high level of behavioral sophistication? Insects like some species of wasps, bees, termites and an

Define the post-herbal period, Define the Post-Herbal Period? It is di...

Define the Post-Herbal Period? It is difficult to draw a sharp line of demarcation between the transition period, marked by various attempts of classification, all of which we

Explain chemical phase of photosynthesis, Q. Where do the photochemical and...

Q. Where do the photochemical and the chemical phase of photosynthesis occur? The photochemical phase of the photosynthesis procedure occurs mainly on the thylakoids the green

What do you determine by atriopore, What do you determine by Atriopore? ...

What do you determine by Atriopore? The external opening to atrium. In cephalochordates water passes across pharyngeal slits into atrium and from there leaves through atriopore

Netlike membranous complex of superposed flat saccules, Q. A netlike membra...

Q. A netlike membranous complex of superposed flat saccules with vesicles detaching from the extremities seen in electronic microscopy. What is the observed structure? What is its

Response to heavy metal stress, Response to Heavy Metal Stress Severa...

Response to Heavy Metal Stress Several heavy metals emanating from industrial mining and sewage disposal operations contaminate the environment. Cadmium is a common contamina

Phospholipids - conjugated lipids, PHOSPHOLIPIDS Most abundant lipid...

PHOSPHOLIPIDS Most abundant lipid present in cell membrane, also called membrane lipid. It is made up of lipid & phosphoric acid. The basic phospholipid is phosphat

Energy requirement during congestive cardiac failure, Q. Energy requirement...

Q. Energy requirement during congestive cardiac failure? Energy: Composition of the calorie requirements on the basis of body weight is usually not feasible due to the presence

What is kingdom monera, What is Kingdom Monera? The eubacteria, archaeb...

What is Kingdom Monera? The eubacteria, archaebacteria, and blue-green bacteria (or cyanobacteria) which form Kingdom Monera lack the cellular organization that all other livin

What is transgenic animal, Question 1 Write a short note on the following- ...

Question 1 Write a short note on the following- Transfection Synthetic seeds Transgenic crops Agrometerology Question 2 Describe any 5 screening techniques use

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