BIO SCI 100 Lecture 6: WEEK 6 BIO

2 Pages
Unlock Document

Biological Sciences

Week 6 – 02/14/17 Other evidence of evolution: 1. Comparative anatomy 2. Embryology 3. Biogeography 4. Molecular Biology Evidence from: 1.Homologous structures: similarities that stem from having common ancestors a. Bone structure b. Can be homologous even though functions different c. Types of structures: i. Anatomical: as notes ii. Behavioral: ex. bird song, sexual posturing iii.Molecular: nucleotide sequence in DNA 2. Evidence in embryo not apparent in adult organism a. Ex.All vertebrates have pharyngeal pouches b. Homologous: fish -> gills, human and mammals -> Eustachian tubes that connect to M. ear and throat. 3.Study of geography distribution of species and populations. Species tend to be more closely related to those from nearby places 4.Universal code: all lifeform share certain molecular trait. Molecular analyze usually conform previous conclusion – COHERENCE – can use molecular homologies when other approaches insufficient History of life on earth: - Geologic time scale of earth: Eras, period, epochs - Each ear, period, epoch covers a series of major events, then punctuated by a catastrophic event From beginning: - Universe – 16 bya - Earth – 4.6 bya - Isoceans followed by origins of life: 3.8-4 bya - Animal forms today: 550 bya - Land Plants: 475 mya - Carboniferous period: 300 mya - Permian extinction (biggest extinction) 70-90% of life from extinct 250 mya - Flower pants (angiosperms) -110 mya - Extinction of dinosaurs – 65 mya - World maps looks familiar – 20 mya - Hominids 5-7 mya (spit from common ancestor with chimpanzees) Four major eras: 1.Precambrian Era: 4.6 bya – 550 mya a. Life exclusively unicellular fro most of earths history b. Oxygen virtually
More Less

Related notes for BIO SCI 100

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.