Class Notes (839,055)
Canada (511,173)
Anthropology (356)
ANTHR101 (204)
Lecture

September 19 notes.docx

2 Pages
41 Views

Department
Anthropology
Course Code
ANTHR101
Professor
Francois Larose

This preview shows 80% of the first page. Sign up to view the full 2 pages of the document.
Description
Anthropology 100, September 19th 2012 Mapping Biological Diversity ­ Human pops differ fin the frequency of alleles, not by the presence or absence of  certain alleles. ­ While some alleles produce discrete variation, many produce continuous  variation. ­ what really separates pops is not that some have alleles others don't, it is just that  the frequency of certain alleles is much higher in some pops than others. *height and skin colour are examples of CONTINUOUS variation. continuous  variations pose a problem when trying to classify people because you have to  MAKE CATEGORIES, and those become arbitrary. *DISCRETE variation means there are relatively few variations of a particular  allele, making it very easy to categorize and determine these features when doing  analysis. Examples: Blood Type. PROBLEM with discrete variation, sometimes  there are actually far too few categories (ear wax, only two categories. limiting).  When something is too limiting, it doesn't tell you much about the people these  differences delineate. ­ when we put these alleles on a map we usually see CLINES, showing allele  frequencies in different populations drifting from one place to another gradually.  (CLINES are gradual changes in the freq. of genotypes or phenotypes over  geographical space) ­ Australians are dark, even though they are further from the equator, because of  genetic drift from papua new guinea where australia was settled from.  Philippines  are lighter cause of multitude of trees that make for a ton of shade. ­ The cline is different for the americas because they migrated only 20000 years  ago from northern european descent. with more time they may have become darker  near the equator. the shades had changed but not all the way to africa dark, not  enough time. ­ Skin colour is in some ways no longer selected for what with our control of  vitamin d and of sunscreen. Skin colour doesn't tell us anything about individuals  except how much their ancestors need protection from the sun or rather needed  exposure to the sun to activate vit.D in 
More Less
Unlock Document

Only 80% of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit