There are two opposing views about origin of Modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA however suggested African origin of Modem man. What kind of observation on DNA variation could suggest this?
Greater variation in Africa than in Asia
Variation only in Asia and no variation in Africa
Greater variation in Asia than in Africa
Similar variation in Africa and Asia
The Correct Option is C
Solution and Explanation
The origin of human races is a much-debated point among scientists studying human evolution. Many scientists argued that different race evolved from Homo erectus independently and that each adapted to a different place-Orientals in Asia, Caucasians in Europe, Aborigines in Australia and so on. However, in recent times, scientists conducting studies on mitochondrial DNA collected from diverse human populations across the globe have put forth a different perspective. Their research findings suggest that all human races trace their origins back to a common ancestor, Homo sapiens, who originated in Africa.
So, the correct option is (C): Greater variation in Asia than in Africa
Top Questions on evolution
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According to evolutionary theory, every evolutionary change involves the substitution of a new gene for the old one and the new allele arises from the old one. Continuous accumulation of changes in the DNA coding for proteins leads to evolutionary differences. The chemical composition of DNA is basically the same in all living beings, except for differences in the sequence of nitrogenous bases. Given below are percentage relative similarities between human DNA and DNA of other vertebrates:
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Concepts Used:
Evidence for Evolution
Evolution evidence is one of the most important pillars of current biological theory. It is the only way to prove all of the proposed evolution theories. Fossils, comparative anatomy, and embryo development patterns are among the evidence used to support biological evolution.
Fossils are the non-degraded remains of living organisms discovered within rocks. The age of the fossil is determined by the layer in which it was recovered. In comparison to the fossils found in the upper layers, those found farther down are older. They provide insight on the condition of the specific region. Palaeontology is the scientific study of fossils.
Comparative Anatomy describes how many organisms share an origin and how natural selection or genetic drift led to the evolution of many diverse organisms. There were two categories of comparative anatomy found: homologous organs and analogous organs.
In Embryonic Development, until a certain stage of gestation, the embryos of various species have a similar structure. Human embryos, pig embryos, reptile embryos, and bird embryos, for instance, have similar embryonic development. As they grow older, they transform into the appropriate species. This demonstrates common ancestry once again.