Exploring Various Lines of Evidence for the Theory of Evolution

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Presentation transcript:

Exploring Various Lines of Evidence for the Theory of Evolution Evidence of Evolution Exploring Various Lines of Evidence for the Theory of Evolution

Lines of Evidence Comparative Anatomy Embryology Biogeography

Comparative Anatomy Similarities in structures between species suggest they descended from a common ancestor. Note the color-coded bones for the limbs of these 4 mammals – though different, they share many similar bones. Describe the function of each animal’s limb in your notes.

Embryology Ernst von Baer (1828): the more closely related any two species are, the more similar their development as embryos. In this game, you will look at pictures of embryos and guess what animal it is. Is it a snake, chicken, possum, cat, bat or human? Write your guess down in your notes, before you look at the answer!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Snake!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Bat!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Cat!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Chicken!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Human!

Are you sure that’s your prediction? Embryology Are you sure that’s your prediction? Possum!

Biogeography Biogeography is the study of the large-scale or global pattern of distribution of species, including the history and causes of this distribution. For this activity, you will explore the history and cause behind the distribution of marsupials. Marsupial distribution across the globe: http://evolution.berkeley.edu/evolibrary/article/0_0_0/lines_11 Distribution today split on two sides of globe – how? Review a few facts of the distribution and marsupials, as well as the history of the Earth, then formulate hypothesis behind distribution

Biogeography Marsupials are a group of mammals that give birth to live young that develop in an outer pouch of the mother. Marsupial distribution across the globe: http://evolution.berkeley.edu/evolibrary/article/0_0_0/lines_11 Distribution today split on two sides of globe – how? Review a few facts of the distribution and marsupials, as well as the history of the Earth, then formulate hypothesis behind distribution Bandicoot Koala Opossum Sugar Glider Kangaroo

Biogeography There is no evidence of any marsupials able to swim across the ocean. No marsupial has been observed wandering across the Asian mainland. There does not appear to be any route of migration between the two populations of marsupials. How do you think some marsupials ended up halfway across the world from the others?

Biogeography Continental Drift over millions of years – watch the movement of land masses

Continental Drift + Distribution of Marsupials Biogeography Continental Drift + Distribution of Marsupials

Biogeography Similar reptilian Mesosaurus fossils found in both South America and Africa  evidence of continental drift (couldn’t swim the ocean, no land bridge  continents once joined)

Biogeography Similar reptilian Mesosaurus fossils found in both South America and Africa (couldn’t swim the ocean, no land bridge)  evidence of continental drift (continents once joined)