<P> Lemurs and humans are both primates . Ancestral primates had brown eyes, as most primates do today . The genetic basis of blue eyes in humans has been studied in detail and much is known about it . It is not the case that one gene locus is responsible, say with brown dominant to blue eye colour . However, a single locus is responsible for about 80% of the variation . In lemurs, the differences between blue and brown eyes are not completely known, but the same gene locus is not involved . </P> <P> While convergent evolution is often illustrated with animal examples, it has often occurred in plant evolution . For instance, C photosynthesis, one of the three major carbon - fixing biochemical processes, has arisen independently up to 40 times . About 7,600 plant species of angiosperms use C carbon fixation, with many monocots including 46% of grasses such as maize and sugar cane, and dicots including several species in the Chenopodiaceae and the Amaranthaceae . </P> <P> A good example of convergence in plants is the evolution of edible fruits such as apples . These pomes incorporate (five) carpels and their accessory tissues forming the apple's core, surrounded by structures from outside the botanical fruit, the receptacle or hypanthium . Other edible fruits include other plant tissues; for example, the fleshy part of a tomato is the walls of the pericarp . This implies convergent evolution under selective pressure, in this case the competition for seed dispersal by animals through consumption of fleshy fruits . </P> <P> Seed dispersal by ants (myrmecochory) has evolved independently more than 100 times, and is present in more than 11,000 plant species . It is one of the most dramatic examples of convergent evolution in biology . </P>

What is the difference between convergent evolution and adaptive radiation