BioeeOctober18 - and migrate iii Parapatric Divisions of...

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

View Full Document Right Arrow Icon
Bioee October 18, 2007 I. Five Examples of How We Think of SModespecies a. Biologically isolated b. Evolutionary species concept- different tracts on evolutionary tree c. Numerical or phenetic taxonomy- taking characters into account, if X% different, new species d. Phylogenetic Systematics (cladism) similar to number two but not tied to evolution e. Species recognition concept- different sounds, looks, actions, species recognize each other II. The Great Problem: Universal Species Definition a. “Species” category is generally not helpful to speciation b. However, species are helpful to systematics and constructing phylogenies c. Because species definitions do not agree: i. Must look at each group or organisms in a special way ii. Species defined by systematisists agree in large part with species defined by natives III. Speciation a. Modes i. Allopatric: Species become different species from living apart; geographic isolation ii. Peripatric: Migration means; pregnant females take part of genome
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: and migrate iii. Parapatric: Divisions of population by mountains/rivers/ext coming up and separating species iv. Sympatric: Division of species in the same area v. Hybrid speciation: mostly in plants b. Reproductive isolation i. Reproductive isolation and phenotypic differentiation are not highly correlated ii. Speciation is hard to observe 1. Not clear when it is happening 2. Sometimes it takes a long time relative to the life of humans 3. One has to know everything about the groups 4. How can you do it? a. Watch microorganisms! b. Biodiversity in sugar water c. Within 5 days, bacteria had diversified into niches d. Bacterial resistance to antibiotics i. Best demonstration of natural selection c. With speciation, within a single genus, it may occur in one way between two species, and another way between two different ones...
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