Sympatric speciation, Biology

Assignment Help:

Sympatric speciation can be regarded as speciation where parent species gives rise to a daughter species without the individuals of a species being separated by space or territory. Both instantaneous and gradual models of sympatric speciation have been proposed. Barring one mode of instantaneous speciation by a mechanism known as polyploidy, other modes of sympatric speciation have remained quite controversial. Polyploidy is quite common among plants. (For a detailed discussion on polyploidy refer to Unit 10 of Block 2 of LSE-03 of Genetics course). A cross between two diploid plants could result in a tetraploid hybrid. The hybrid would remain largely reproductively isolated from its diploid parents. The reason for such isolation is that due to back-crossing if a triploid individual were to be formed, it will produce a high proportion of nonviable gametes. There is also a possibility that interbreeding between deploid and tetraploid forms or between different tetraploids may give rise to other polyploids.


Related Discussions:- Sympatric speciation

Explain arterial continuous mummer, Explain arterial continuous mummer? ...

Explain arterial continuous mummer? Arterial Continuous Mummer : These originate in constricted arteries as in carotid or femoral artery obstruction (Mummer are louder in sys

Why is the krebs cycle also called the final common pathway, Why is the Kre...

Why is the Krebs cycle also called the final common pathway of the degradation of organic compounds? The Krebs cycle is known as the final common pathway of the degradation of

Thalopyta, cherector and economic imoprtance of fungi snd algae

cherector and economic imoprtance of fungi snd algae

Mechanism of circulatory system, MECHANISM - 1 .      AURICULAR SYSTO...

MECHANISM - 1 .      AURICULAR SYSTOLE - First of all from complete body impure blood comes in R.A. by superior and inferior vena cava or pre and post cavals. Pure blo

Chlamydiosis-clinical manifestations, Clinical manifestations Since the...

Clinical manifestations Since the disease due to Chlamydia involves many organs/systems, system-wise descriptions of clinical signs is described as under: Genital infectio

What are disaccharides, Q: What are disaccharides? Although theoretical...

Q: What are disaccharides? Although theoretically disaccharides could be made up of two trioses, tetroses, pentoses but all naturally occurring disaccharides contain hexose mol

What do you mean by diabetes mellitus, Q. What do you mean by Diabetes Mell...

Q. What do you mean by Diabetes Mellitus? Diabetes Mellitus as you know is a metabolic disorder, which is characterized by high blood sugar. It is a chronic disease condition,

Describe the symptoms of edema, Describe the clinical significance and symp...

Describe the clinical significance and symptoms of edema. How does edema (in its different forms listed in your text) appear on medical imaging examinations? Discuss any specific c

What is mitral stenosis, Q. What is mitral stenosis? Most common cause ...

Q. What is mitral stenosis? Most common cause of mitral stenosis is rheumatic fever. Nearly 30 per cent of patients with rheumatic fever may go on to develop pure mitral valve

Discuss the concept of alpha-islet cells of the pancreas, Glycogen A. p...

Glycogen A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-islet cells of the pancreas. C. bindi

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