Speciation, Biology

Assignment Help:

SPECIATION -

  • Origin of new species: An isolated population of a species independently develops different types of mutations.
  • The later accumulate in its gene pool. After several generations, the isolated population becomes genetically and reproductively different from others so as to constitute a new species.
  • The million of different species that exist today did not emerge by any single sequence of events but have come into existence by following types different paths of speciation.

1.       PHYLECTIC SPECIATION -

  • Darwin entitled his great book.
  • For Darwin, speciation was the simple, gradual accumulation of changes in a lineage throughout time, until the group was distinct enough to be considered a new species. This process is now called phyletic speciation.

2.       ALLOPATRIC SPECIATION -

  • It is considered as the most common type of speciation.
  • Allopatric speciation typically occurs when a physical barrier i. e., a mountain range, a river, or an oil pipeline, geographically separates a population from its parental population.
  • E.g., Different species of Darwin finches in the Galapagos Island.

3.       SYMPATRIC SPECIATION -

  • Sympatric speciation occurs in populations where individuals continue to live among one another, even though some type of biological difference, such as the time of the year when gonads mature, has divided the members into different reproductive groups.
  • The best accepted cases of sympatric speciation occur in plants as a result of polyploidy, an increase in the number of sets of chromosomes per cell occurs.

4.       PARAPATRIC SPECIATION -

  • Parapatric speciation is thought to occur in populations that lie adjacent to one another.
  • Gene pools diverge because the environment varies sufficiently in the different localities.
  • As a result, different traits are selected in each population.

Related Discussions:- Speciation

What is the rule for the pairing of nitrogen-containing base, Q. What is th...

Q. What is the rule for the pairing of nitrogen-containing bases in the DNA molecule? And in the RNA? Is this the last question appropriate? The rule for the pairing of nitroge

Define microorganism in fermentation foods process, Normal 0 fa...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Enzymology, Ethylene glycol is a poison that causes about fifty deaths a ye...

Ethylene glycol is a poison that causes about fifty deaths a year in the United States. Treating people who have drunk ethylene glycol with massive doses of ethanol can save their

Precautions for determination of fungal and yeast count, Explain Precaution...

Explain Precautions for Determination of Fungal and Yeast Count? 1. Maintain aseptic conditions. 2. Keep alcohol away from flame. 3. To avoid infections and allergies, ca

Why are salt and sugar used in the production of dried meat, Why are salt a...

Why are salt and sugar used in the production of dried meat and dried fruits? Substances that maintain a highly hypertonic environment, such as sugar and salt, are used in the

Explain the four initial stages of the embryonic development, What are the ...

What are the four initial stages of the embryonic development? The four initial parts of the embryonic development are the morula stage, the blastula stage, the gastrula stage

Fast response - biological responses, Fast Response - Biological Responses ...

Fast Response - Biological Responses Some of the fast responses are discussed below: It was found that when mung bean root tips were kept in a specific solution (contain

How is water''s importance to life, How is water's importance to life refle...

How is water's importance to life reflected in the normal range of internal pH values that living things are likely to have?

Classification of viruses, Classification of Viruses No evolutionary or...

Classification of Viruses No evolutionary or phylogenetic exist between viruses. A   nature system of classification cannot, therefore, be devised for viruses. Holmes (1948)

What is metabolic disorders, Q. What is metabolic disorders? In these m...

Q. What is metabolic disorders? In these metabolic disorders, since there is an inability to metabolize a specific amino acid the basis of dietary management is to restrict the

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