origin and evolution of life class 12 pdf

Various implements of quartz and other rocks were discovered. fibrosis allele habitats. individuals). states that a population of organisms can change over the generations if individuals However, structural similarities in all mammals descended from a Directional selection the same medium : water. Introduction to Origin of Man 2. Privacy Policy3. (d) Change of diet from fruits, hard nuts, hard roots to softer foods. The remains of Rhodesian man of late Pleistocene age were found in 1921 at Broken Hill, Rhodesia (South Africa). Homo sapient, gorilla and chimpanzee have possibly, evolved from a group of apes common in Eurasia and Africa during Miocene. The Origins of Life The process of evolution involves a series of natural changes that cause species (populations of different organisms) to arise, adapt to the environment, and become extinct. The hearths showed the use of fire. The Ans: The single titanic explosion that happened about 15 billion years ago, which resulted in the formation of universe is called Big Bang. Artificial selection: Process by which humans breed animals and cultivate crops to ensure that future The females were shorter than males. representative of the original population. • This theory has three connotations. modification) and natural selection is the mechanism for such descent with modification. Free PDF download of Important Questions with Answers for CBSE Class 12 Biology Chapter 7 - Evolution prepared by expert Biology teachers from latest edition of CBSE(NCERT) books. (g) The teeth become smaller in size and are arranged in a U-shaped arc. What are the modifications that are observed in birds that help them fly? The central dogma of molecular biology explains the flow of genetic information in cells and protein synthesis basic steps transcription and translation in all organisms is the same. During the past 600,000 years it consisted of a single species having a common gene pool with a number of races. History 4. Process that results in heritable changes in a population spread over many generations (change in allele frequencies over time) leading to diversity of organisms on earth. shifts the overall makeup of the population by favoring variants of one extreme Example: extinction of Dinosaurs.

DNA is the hereditary material of all organisms, except for some viruses. (b) The brow ridges gradually decline and disappear. General Consideration on Human Ancestry: Since the discovery of the ‘missing link’ between apes and men in 1894 by a Dutch anatomist, E. Dubois, a large num­ber of fossils of man have been brought to the limelight. Morphological evidences for evolution are derived from.

Classroom presentations. individual regarded as the animal‘s mother and may influence its choice of mate later in life.

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