12/22/2023 0 Comments Alfred russel wallace butterflies![]() that they can no longer interbreed to form fertile offspring, this can result in the formation of two species. If two populations of one species become increasingly different in phenotype close phenotype The visible characteristics of an organism which occur as a result of its genes.On his return to England (1859), he began work on his huge collections and the preparation of his famous paper, presented in 1861 (published 1862) as. Both genes and the environment can cause variation, but only genetic variation can be passed on to the next generation. Wallace returned to England in 1852, but Bates remained 11 years, exploring the entire valley of the Amazon, where he collected about 14,712 species, mostly of insects, 8,000 previously unknown.Over a period of time, a species will gradually evolve.Their genes are less likely to be passed on to the next generation. Individuals that are poorly adapted to their environment are less likely to survive and reproduce.The genes that allow these individuals to be successful within their environment are passed on to their offspring, which results in these specific genes becoming more common. This is commonly known as survival of the fittest. Individuals with characteristics most suited to their environment are more likely to survive and reproduce.This overproduction leads to competition, eg for food. In every population more offspring are produced than can survive.caused by random mutations close mutation A random and spontaneous change in the structure of a gene, chromosome or number of chromosomes. ![]() A gene is a section of DNA which controls part of a cell's chemistry - particularly protein production. and this variation is a result of differences in their genes close gene The basic unit of genetic material inherited from our parents. He realized the cabinets value to the history of science. Individuals in a species show a wide range of variation close variation Difference between individuals of the same species. But eventually Heggestad read enough about Wallace to get drawn in. ![]()
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