Genetic Flow versus Founder Effect - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
USMLE Articles
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam

Thread Tools Search this Thread Display Modes
Old 01-17-2011
kemoo's Avatar
USMLE Forums Guru
Steps History: 1+CK+CS
Posts: 378
Threads: 161
Thanked 101 Times in 51 Posts
Reputation: 115
Genetics Genetic Flow versus Founder Effect

Hi guys I am confused about the difference between genetic flow and founder effect
Reply With Quote Quick reply to this message

Old 01-17-2011
USMLE Forums Master
Steps History: 1+CK+CS
Posts: 590
Threads: 31
Thanked 1,223 Times in 409 Posts
Reputation: 1247
Default gene flow & founder effect

So, imagine we live in a fairly remote village in the mountains. We have commerce with a dozen other villages, and it is the custom for women from one village to marry men from another. This intermarriage is a good thing, as it mingles alleles in what could be several isolated gene pools, like little streams flowing between ponds. This is gene flow. It maintains a greater allelic variety by exchanging traits between populations, and, in theory, prevents speciation.

One hard winter, there is a terrible avalanche, and the village at the edge of this community is permanently cut off from the other villages. During this hard winter, half the children died of starvation. A band of young men went off to steal brides from the wild nomad tribes far to the east, but never returned. There were only twenty people of procreating age left in the village, and several of them were somewhat related to me. We renamed the village Mondoshawania, since we were almost the founding family of the new composition of the village. The prevalence of some alleles for recessive traits was drastically increased (like my cousins' red hair) or decreased , as the genetic makeup of this one family was overly represented now in the gene pool of the village. This is the founder effect, and it is seen in bottleneck events.

Hope that helps!
Reply With Quote Quick reply to this message
The above post was thanked by:
13monument (01-17-2011), adrenaline rush (01-17-2011), ahmednabil616 (01-18-2011), Amenah (01-18-2011), chrisolaiya (01-18-2011), destined (01-17-2011), donofitaly (01-18-2011), DR HB (01-17-2011), kemoo (01-18-2011), Sabio (01-17-2011), StepTaker (01-17-2011)



Quick Reply

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Where you live. Leave blank if you don't want to tell.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ventricular System CSF Flow Sequence Mnemonic! heights USMLE Step 1 Mnemonics 1 07-12-2011 08:43 PM
Forward to Regurgitant Flow Ratio futureresident USMLE Step 1 Forum 10 02-18-2011 07:41 AM
Increased coronary blood flow in aortic stenosis ecgram USMLE Step 1 Forum 2 05-22-2010 01:16 PM
Innocent or Systolic Flow Murmur! Hohepa USMLE Step 2 CK Forum 1 04-05-2010 06:06 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)