Lecture 20&21 - Australipithecus"southern...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
BIOLOGY 1001: LECTURE 20 MORPHOLOGICAL INNOVATION AND THE HUMAN LINEAGE Time line in human evolution: Bony fishes: 450 million years Amphibia: 350 million Reptiles: 300 million Mammals: 190 million Placental mammals: 90 million Primates: 65 million Apes: 35 million Hominid: 6 million Major innovations from the fishes to the primates: 1.Lungs in Fishes 2.Paired walking appendages in Amphibia 3.More efficient lungs and waterproof skin in Reptiles 4.Extensive maternal care, endothermy, and large brains in Mammals 5.Larger brains in Primates ENDOTHERMY - utilization of metabolic energy to maintain constant body temperature ECTOTHERMY - utilization of external energy (e.g. sunlight) to maintain temperature HOMINID - all members of the human lineage since divergence from the apes, including the genus
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Australipithecus ("southern ape") and the genus Homo Factors associated with larger relative brain size in contemporary species: 1.Complex environment a.Distribution of food:fruit eaters > leaf eaters carnivores > herbivores b.Type of habitat: above-ground > burrowing animals 2.Reliance on memory: food-storing species > non-food-storing Fossil evidence shows that the genus Homo originated in Africa Genetic data also suggests African origins; mitochondria DNA variation suggests common female ancestor 0.2-1.0 million years ago Human genetics reveals patterns of diversification due to the micro-evolutionary principles of gene flow, drift, and selection....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern