BIO153H5 Lecture Notes - Lecture 20: Homo Habilis, Foramen Magnum, Paranthropus
Document Summary
Posses long arms, no tails, and spend most of their time in trees. All apes have larger brains than other primates when compared to body size. New are not closely related to great apes (paraphyletic) Humans have a 99% shared dna with chimp (pan) This 1% difference is significant when comparing 3 billion base pairs. 19 regulatory genes that are expressed differently between humans and chimps. Chimps have 48 chromosomes and humans have 46. The discrepancy is related to chromosome #2. Either it split to form two additional chromosomes to go from 46 to. Or chromosome #2 and #3 infused to reduce the chromosome number from 48 to 46. This reduces the chance of hybridization between humans and chimps. The oldest of these hominins can trace its origin back about 6. 5 million years. An early hominin (ardipithecus ramidus) exhibited a more pronounced bipedal posture as exhibited by the replacement of the foramen magnum in the skull and orientation of pelvis.
