Self- vs. cross-pollination, Biology

Assignment Help:

Self- vs. Cross-Pollination

A major advantage of self-pollination is its certainty. Continued self-pollination over many generations, however, results in weaker progeny. This is considered to like inbreeding depression. From the evolutionary point of view, self-pollination is a disadvantage as 'there is no scope of genetic recombination. Cross-pollination brings pollen grains from other plants which are genetically different. Genetic heterogeneity is advantageous for the plant in many respects.

The offspring are more vigorous and better adapted for survival even under adverse environmental conditions. Thus cross-pollinated species show wider distribution when compared to self- pollinated species. Thus cross-pollination is favorable for evolution. The main disadvantage of cross-pollination is its uncertainty. It also involves considerable expenditure of resources by the plants as they have to produce an enormous amount of pollen, as compared to self-pollinated plants, to compensate for wastage. Further, when the pollinating agent is an animal, the plant should also provide adequate rewards for the pollinating agent in the form of pollen or nectar.


Related Discussions:- Self- vs. cross-pollination

Which is right of the resting membrane potential, Which is true of the rest...

Which is true of the resting membrane potential? A. It requires few ions to be distributed unevenly. B. It has the same value in all cells C. Only nerve and muscle cells h

Mixed aortic stenosis and regurgitation, Mixed Aortic Stenosis and Regu...

Mixed Aortic Stenosis and Regurgitation :  The combined aortic valve stenosis and regurgitation may be of congenital or acquired aetiology, as in aortic stenosis. Most common

Essay, Need an essay in regard to an experiment that I did. Essay Assignm...

Need an essay in regard to an experiment that I did. Essay Assignment: Experimental Design Now that you have completed several hands-on lab experiments, take a little time to con

How do malign neoplasias appear, Q. How do malign neoplasias appear? Th...

Q. How do malign neoplasias appear? The Neoplasias appear due to DNA mutations in genes that regulate the cellular proliferation thus making the cell lose its capacity to contr

How are mammals characterized, Q. Mammal identity card. How are mammals cha...

Q. Mammal identity card. How are mammals characterized according to examples of representing beings, skin, respiration, nitrogen waste, basic morphology, circulation, thermal contr

What are the three main types of trophic pyramids, What are the three main ...

What are the three main types of trophic pyramids studied in Ecology? The three types of trophic pyramids studied in Ecology are the numeric pyramid, the biomass pyramid and th

Explain differential staining technique, Explain Differential Staining Tech...

Explain Differential Staining Technique? It divides bacteria into separate groups based on staining properties, like Gram's stain, Acid-fast stain etc. Here 2 or more contrasti

Explain glycerol esters of fatty acids, Explain Glycerol esters of fatty ac...

Explain Glycerol esters of fatty acids Glycerol esters of fatty acids, which make up to 99% of the lipids of plant and animal origin have been traditionally called  fats and oi

Importance of mendelism, IMPORTANCE OF MENDELISM 1 .       Improvement...

IMPORTANCE OF MENDELISM 1 .       Improvement of Plants Hybridization is used for obtaining improved varieties of plants. This process results in combinations of desirable

General principles in treatmemt of heart failure, The goals of treating hea...

The goals of treating heart failure are relief of symptoms, improvement in   exercise tolerance, and reduction in the number of hospitalizations, decreasing morbidity and mortality

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