B1.8 0.0 / 5 ? BiologyB1.8GCSEAQA Created by: elisha.ksCreated on: 19-02-17 17:49 what does studying the similarities and differences between organisms allows us to do classify living organisms into animals, plants and microorganisms, and helps us to understand evolutionary and ecological relationships 1 of 19 why do species with similar characteristics often have similar genes share a recent common ancestor, so they're closely related 2 of 19 why might genetically different species look alike they've adapted to similar habitats but aren't closely related as they've evolved from different ancestors 3 of 19 the more recent the common ancestor... the more closely related the species are 4 of 19 if organisms in the same environment have similar characteristics what might this suggest that they may be in competition 5 of 19 what is Darwin's theory of evolution all species of living things have evolved from simple life forms that first developed more than three billion years ago 6 of 19 natural selection step 1 individual organisms within a particular species may show a wide range of variation because of differences in their genes 7 of 19 natural selection step 2 individuals with characteristics most suited to the environment are more likely to survive to breed successfully 8 of 19 natural selection step 3 the genes that have enabled these individuals to survive are then passed on to the next generation 9 of 19 what can cause genetic differences within a species sexual reproduction or mutations 10 of 19 what is mutation a change in an organism's DNA 11 of 19 why might a mutation be beneficial if it produces a useful characteristic: may give better chance of surviving and reproducing: new forms of a gene 12 of 19 why theory of evolution by natural selection was only gradually accepted (1) the theory challenged the idea that God made all the animals and plants that live on Earth 13 of 19 (2) there was insufficient evidence at the time the theory was published to convince many scientists 14 of 19 (3) the mechanism of inheritance and variation was not known until 50 years after the theory was published 15 of 19 Lamarck's theory based on idea that changes that occur in an organism during its lifetime can be inherited 16 of 19 what do we now know in the vast majority of cases this type of inheritance cannot occu 17 of 19 why might scientists produce different hypotheses to explain similar observations different beliefs, influences 18 of 19 how can you prove a hypothesis finding evidence to support it/ disprove others 19 of 19
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