A dichotomus key is a tool that is used by the scientists, they use it to help identify a particular specimen while branching is just a branching into two
The answer B I hope this help you
Answer:
Polydactyly is a genetic condition where formation of extra finger or toe takes place.The extra finger or toe is called as supernumerary.
Explanation:
Polydactyly is associated with mutation in genes in their cis position Mutation in Hoxa gene also results in polydactyly.
It is associated with autosomal dominant mutation that occur in single gene.
This condition appears 1 in every 500.This is a common disorder in African black children and is more frequently found in Africans that are living in Eastern and central part.
Polydactyly is mainly affects the right toe or finger.
It is common in men.
The extra digit may be functional or not,partly formed with some bone.
I believe the correct answer is that The genetic variation between humans and orangutans is the greatest.
We cannot say that there is no genetic variation at all, because there obviously is - we are not the same as the other three apes, even though we have a common ancestor. Also, we cannot say that we are completely the same, because there are obvious differences. And finally, we didn't originate from those three animals, but rather all of us come from the same organism.