Login

Join for Free!
119270 members


Molecular Biology

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

Moderator: BioTeam

Molecular Biology

Postby jimslady » Tue Dec 14, 2004 12:44 am

In a population of ear infection causing bacteria, there may be some members with a rare antibiotic-resistant allele. The environment changes when the person with the ear infection takes an antibiotic. All the bacteria with a sensitive allele die, but the resistant bacteria survive and thrive.
A. Has the frequency of each allele in the population changes?
B. Is this an example of natural selection? Why?
C. Is this an example of microevolution? Why?

Thanks for any help with this one.
jimslady
Garter
Garter
 
Posts: 4
Joined: Tue Dec 14, 2004 12:39 am

Postby biostudent84 » Tue Dec 14, 2004 12:49 am

A. Yes. The antibiotic-resistant bacteria live, while the rest die...this makes the population near-100% have antibiotic resitant genes.

B. Yes. The "strongest" survived...in this case, the organisms that were antibiotic resistant.

C. Debatable, but I say yes. In this particular population, the majority of the species went from being non-antibiotic resistant to antibiotic resistant.

Kyle
User avatar
biostudent84
Site Admin
Site Admin
 
Posts: 974
Joined: Thu Nov 11, 2004 6:00 am
Location: Farmville, VA

Postby RobJim » Thu Feb 10, 2005 1:37 am

Are you getting questions on microevolution in your class? I didn't think it was a scientific term.

EDIT - It looks like it is actually used by scientists.

http://evolution.berkeley.edu/evosite/evo101/IVMicroevolution.shtml
RobJim
Death Adder
Death Adder
 
Posts: 70
Joined: Mon Feb 07, 2005 10:54 am



Return to Molecular Biology

Who is online

Users browsing this forum: No registered users and 1 guest