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3.5 discuss the role of chromosome mapping in identifying relationships between species
discuss the role of chromosome mapping in identifying relationships between species
- Once chromosome or genetic maps have been produced for two different species, degrees of genetic similarity can be established by using various computer programs. If the two species are very closely related, then their chromosome maps will be very similar.
- Chimpanzees and humans have DNA similarities of more than 98%. This suggests that humans and chimpanzees had a common ancestor in quite recent times.
- A chromosome map that has been produced by percentages of recombinations of genes during crossing over does not completely represent a whole chromosome. Chromosome maps based on recombinations can only be used to produce the relative positions of genes, not the absolute ones.