Lecture4-28Jan

Lecture4-28Jan - Science Genius Girl -Freezepop...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Science Genius Girl -Freezepop Announcements: Announcements: • Labs start this week Labs start this week • Biol152@ Biol152@ ku ku .edu edu • SSD sessions start this week SSD sessions start this week • SSD instructors will be on Blackboard SSD instructors will be on Blackboard • Mon 7 Mon 7 -8 • Tues 9 Tues 9 -10 10 • Wed 10 Wed 10 -11 11 Homology Homology – resulting from common ancestry E.g., mammalian forelimbs Analogy Analogy – resulting from convergence, not common ancestry E.g., wings, long bills
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Last time Last time …. • Violations of H-W equilibrium – Drift, mutation, finite pops, non-random breeding, Natural Selection • All lead to evolution in populations – Microevolution • Today….species formation, macroevolution • But first, maintenance of variation Maintaining variation Maintaining variation • Recessive alleles hide in heterozygotes – Cannot be purged by selection • Heterozygote advantage – Ex: sickle-cell anemia (codominant) • aa = anemic, Aa = malaria resistance • Frequency-dependent selection – parasites • Timing of selection • Neutral variation (for now?) Variation is widespread is widespread • Individuals differ – Within and among populations • Continuous variation – Often same species • Discontinuous variation (gaps/shifts) – Leads to speciation- > increased diversity Microevolution - within species Macroevolution - above the species level Same processes
Background image of page 2
3 Maintaining continuous variation Maintaining continuous variation
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/30/2008 for the course BIO 152 taught by Professor Mort during the Spring '08 term at Kansas.

Page1 / 11

Lecture4-28Jan - Science Genius Girl -Freezepop...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online