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http://www.biomedcentral.com/news/20031124/03
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The question of whether the evolution of large and complex genomes in complex multicellular organisms is due to natural selection or simply a function of chance has been the subject of considerable debate. In November 21 Science, Michael Lynch and John Conery at Indiana University argue that the inclusion of intragenic spacers—introns—and transposons, coupled with the increase in gene number associated with genomes of multicellular animals and plants, were not essential for adaptive phenotypic diversification during eukaryotic evolution, but are the result of orders-of-magnitude reductions in population size. This process magnified random genetic drift and prevented “purifying” natural selection from removing them (Science, 302:1401-1404, November 21, 2003).
Interesting statement..We have introns, but small eukaryotes do not, not because they are good for us but because our population size is too small for us to stop them accumulating.
The theory of complex genomes evolving by chance suggests that the intricate genetic makeup of living organisms developed purely through random mutations and natural selection, without any predetermined plan or purpose.
Yes, there is strong evidence from various fields of science, such as genetics, biology, and paleontology, that supports the theory of complex genomes evolving by chance. For example, the fossil record shows a gradual development of more complex organisms over time, and genetics studies have identified specific mutations that have led to new traits in species.
This is a highly debated question and there is no clear answer. While some scientists argue that complex genomes can evolve purely by chance through natural selection, others believe that there is some level of design or purpose behind the development of life.
The theory suggests that random mutations and natural selection have led to the development of diverse and complex life forms on Earth. As organisms adapted to their environments, they evolved different traits and characteristics, resulting in the vast array of species we see today.
Yes, there are some criticisms and challenges to the theory. Some argue that certain complex features in organisms, such as the human brain, cannot be explained solely by chance and natural selection. Others question the likelihood of certain genetic mutations occurring by chance and leading to new traits. However, the theory continues to be widely accepted and studied in the scientific community.