Transcript Bot3404_11_week3.1 - Ecological Evolution – E

Announcements
Exam next Tuesday (already!!)
Lab this week will NOT be in the herbarium – we are still
cleaning up!!
Lab will be in Rm. 202, as usual.
Next Thursday, we'll start reading scientific articles and you will
be expected to discuss and write brief essays about these
articles.
Bit of a review on Thursday
Come with questions.
You will be responsible for the reading
in your textbook as well as the lecture
material.
Be able to identify all the parts of a
plant.
Know your life cycles
Endosperm
Cavitation
Vascular tissue in a plant
Tension-cohesion theory
Transpiration
Archaeorhizomycetes
Endophytes
Plant hormones
Auxin
Cytokinin
Giberellins
Abscisic acid
Plant evolution
the process of speciation is
still very much a mystery.
How long does it take?
What is a species?
What is evolution?
Four mechanisms driving evolution
1. Parents vary in their characteristics.
2. Offspring inherit characteristics from
parents (genetics).
3. Some offspring compete better than
others for necessities of life.
4. Many more offspring are produced
than can survive.
Types of evolution
Neutral or 'drift'
Stabilizing
Directional
Diversifying
Selection pressures change through time
Levels of evolution
Genes or DNA
Genome
Individual
Population
Species
Species flock or grove
Ecological community