Process of evolutionary change, Biology

In that Unit you also learnt about Darwin, who based on his extensive observations and interpretations showed that evolution is a simple fact of nature. It was Theodosius Dobzhansky, a population geneticist and one of the trinity to structure the modern synthetic theory of Evolution, who emphatically stated, "Nothing in Biology makes sense, except in the light of evolution". Today the Darwinian concept of evolution through natural selection has stood the test of time. As Julian Huxley rightly pointed out "Darwin rendered evolution inescapable a,s a fact, comprehensible as a process and all embracing as a concept". In Unit 10 of this Block you were cited several examples from studies on palaeontology , biogeography, anatomy, embryology, physiology and biochemistry as evidence in support of the evolutionary process. In this Unit we will more specifically discuss the mechanism of evolutionary change. We will elaborate on the Darwinian concept and look into its basic tenets. There will be a detailed discussion on the sources of variability, since variability is the raw material on which natural selection acts to produce adaptations. We will also explain the concept of Darwinian fitness and relate it to the reproductive success of organisms. Finally you will also become familiar with the different ways in which selection can act. In other words, this Unit will highlight that natural selection promotes structural, functional and ecological adaptations of individuals, populations and species to their existing environments.

Posted Date: 4/6/2013 12:54:38 AM | Location : United States







Related Discussions:- Process of evolutionary change, Assignment Help, Ask Question on Process of evolutionary change, Get Answer, Expert's Help, Process of evolutionary change Discussions

Write discussion on Process of evolutionary change
Your posts are moderated
Related Questions
Why does the recombination frequency of genes vary with the distance between them in the chromosome? The farther the distance among the loci of two genes in a chromosome the h

How many distinct hexapeptides can be made from 20 amino acids?

Q. How many ATP molecules are made after the aerobic respiration and what is the net energetic gain of the process? After aerobic respiration 38 ATP molecules are made with the

What is the radula? What is the function of this organ? Some molluscs have a tongue-like structure with harsh saliences similar to small teeth. This structure is called radula

Proteins Protease inhibitors: Protease inhibitors are protein-based substances widely distributed within the plant kingdom, including the seeds of most cultivated legumes wh

What are the types of changes encountered during the Support phase Adaptation - To accommodate changes to its environment Correction - To uncover defects in the Software

Q. Cnidarians and Poriferans do not have excretory systems. Do platyhelminthes have an excretory system? Platyhelminthes have a primitive excretory system made of flame cells

Onchology : This is the study of cancer. Oncology word meaning is mass, bulk & tumor. This is a branch of medicine which deals with tumors (cancer). The one who practices oncology

Q. Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echi

From Molecules to the First Cell The prebiotic conditions on the earth in all probability were volcanic eruptions, lightning and heavy rains. There was no trace of free oxygen