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Oct 25, 2024 · Evolution, theory in biology postulating that the various types of living things on Earth have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations. The theory of evolution is one of the fundamental keystones of modern biological theory.
- Francisco Jose Ayala
The theory does so by analyzing the evolution of fitness components, so-called life history traits, and how they interact: size at birth; growth pattern; age and size at maturity; number, size ...
May 15, 2022 · The book contained two major arguments: First, Darwin presented a wealth of evidence of evolution. He said that all living things on earth today are the descendants - with modifications - of earlier species. Second, he proposed a mechanism - natural selection - to explain how evolution takes place.
Once the multicellular organisms evolved, evolution happened at a much faster pace. The further series of development and evolution of new organisms like invertebrates, plants, animals such as reptiles, fish, amphibians, mammals, etc., took place within a time range of 500-300 million years ago (mya).
- 52 min
- The four mechanisms of evolution are: Mutation. Gene Flow. Genetic Drift. Natural Selection.
- The Hardy-Weinberg equilibrium mathematically explains the occurrence and consistency of gene frequency for a particular gene. The principle states...
- Natural Selection is the key mechanism of evolution. It is the differential survival and reproduction of individuals due to differences in the phen...
- Genetic Drift is the change in the frequency of a gene variant in a population due to the random sampling of organisms.
- Mutations are defined as the changes in the DNA sequence of a living organism. The mutations occurring in the germ cells, i.e., the egg or sperm ce...
- When there is a sudden decrease in the population due to some environmental factors, such as an earthquake, tsunami, epidemics, etc., some genes ar...
Life cycle. All organisms follow a specific sequence in their development, beginning with gestation and ending with death, which is known as the life cycle. Events in between usually include birth, childhood, maturation, reproduction, and senescence, and together these comprise the life history strategy of that organism.
For example, when natural selection leads to bill-size change in medium ground finches in the Galápagos, this does not mean that individual bills on the finches are changing. If one measures the average bill size among all individuals in the population at one time and then measures them in the population several years later, this average value will be different as a result of evolution.
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Oct 21, 2024 · Human evolution, the process by which human beings developed on Earth from now-extinct primates. The only extant members of the human tribe, Hominini, belong to the species Homo sapiens. The exact nature of the evolutionary relationships between modern humans and their ancestors remains the subject of debate.
