Charles Darwin first proposed the theory of evolution by natural selection in 1859. His theory explained how organisms gradually change over generations through inherited traits that aid survival. Jean Baptiste Lamarck proposed an earlier theory of evolution in 1809 that traits acquired over a lifetime could be inherited, which is now known to be incorrect. The theory of evolution is based on genetic variation and natural selection, where advantageous traits increase an organism's chances of surviving to reproduce and pass on those traits.
Charles Darwin first proposed the theory of evolution by natural selection in 1859. His theory explained how organisms gradually change over generations through inherited traits that aid survival. Jean Baptiste Lamarck proposed an earlier theory of evolution in 1809 that traits acquired over a lifetime could be inherited, which is now known to be incorrect. The theory of evolution is based on genetic variation and natural selection, where advantageous traits increase an organism's chances of surviving to reproduce and pass on those traits.
Charles Darwin first proposed the theory of evolution by natural selection in 1859. His theory explained how organisms gradually change over generations through inherited traits that aid survival. Jean Baptiste Lamarck proposed an earlier theory of evolution in 1809 that traits acquired over a lifetime could be inherited, which is now known to be incorrect. The theory of evolution is based on genetic variation and natural selection, where advantageous traits increase an organism's chances of surviving to reproduce and pass on those traits.
Charles Darwin first proposed the theory of evolution by natural selection in 1859. His theory explained how organisms gradually change over generations through inherited traits that aid survival. Jean Baptiste Lamarck proposed an earlier theory of evolution in 1809 that traits acquired over a lifetime could be inherited, which is now known to be incorrect. The theory of evolution is based on genetic variation and natural selection, where advantageous traits increase an organism's chances of surviving to reproduce and pass on those traits.
Download as PPTX, PDF, TXT or read online from Scribd
Download as pptx, pdf, or txt
You are on page 1of 9
Charles Robert Darwin Theory
The theory of evolution by natural selection,
first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring. Darwinism is a theory of Biological Evolution Jean Baptiste Lamarck Theory In 1809 he published Philosophie Zoologique, in which he described a two part mechanism by which change was gradually introduced into the species and passed down through generations. His theory is alternatively referred to as the theory of transformation or simply Lamarckism. Though today Lamarck's work is considered a major step forward, in his lifetime he did not receive much recognition. The theory of evolution is based on the idea that all species are related and gradually change over time. Evolution relies on there being genetic variation? in a population which affects the physical characteristics (phenotype) of an organism. Some of these characteristics may give the individual an advantage over other individuals which they can then pass on to their offspring. • Anatomy Species may share similar physical features because the feature was present in a common ancestor (homologous structures). When two or more organs or structures are basically similar to each other in construction but are modified to perform different functions, they are said to be serially homologous. • Molecular Biology • Although they're great for establishing the common origins Like structural homologies, of life, features like having DNA similarities between biological or carrying out transcription molecules can reflect shared and translation are not so useful evolutionary ancestry. for figuring out how related The same genetic material (DNA) particular organisms are. We The same, or highly similar, genetic codes need to use different types of The same basic process of gene expression molecular features, such as the (transcription and translation) nucleotide sequences of genes in The same molecular building blocks, such order for us to determine which as amino acids. organism in a group are most These shared features closely related suggest that all living things are descended from a common ancestor, and that this ancestor had DNA as its genetic material, used the genetic code, and expressed its genes by transcription and translation. Biogeography For instance, there are The geographic distribution of unique groups of plants organisms on Earth follows and animals on northern patterns that are best and southern continents explained by evolution, in that can be traced to the combination with the split of Pangaea into two movement of tectonic plates supercontinents (Laurasia over geological time. For in the north, Gondwana in example, broad groupings of the south). organisms that had already evolved before the breakup of the supercontinent Pangaea (about 200 million years ago) tend to be distributed worldwide. • Fossils scientists can roughly date any preserved remains, fossils using radiometric impression, or trace of any dating, a process that once-living thing from a measures the radioactive past geological age. decay of certain elements. Examples include bones, The use of radiometric shells, exoskeletons, stone dating was first published in imprints of animals 1907 by Bertram Boltwood or microbes. Fossils are and is now the principal often contained in rocks that source of information about build up in layers the absolute age of rocks and called strata. The strata other geological features, provide a sort of timeline, including the age with layers near the top of fossilized life forms or being newer and layers near the age of the Earth itself, the bottom being older. and can also be used to date a wide range of natural and man-made materials.