Lab 8 akp biology

Lab 8 akp biology - Akshay Patel 01/20/2010 Period 1 Lab 8:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Akshay Patel 01/20/2010 Period 1 Lab 8: The Effect of Natural Selection on a Population Abstract: The objective of this lab is to calculate allele and genotype frequencies using the Hardy- Weinberg theorem, learn the effect of natural selection on allelic frequencies, the affect of selection against the homozygous recessive condition, and the relationship between evolution and changes in allele frequencies. From the information known, it can be inferred that if the allele frequencies and the genotypic frequencies remain constant from generation to generation, then the population is in genetic equilibrium. In this experiment, different types of Goldfish crackers will be used to see a population that is in equilibrium and a population undergoing natural selection against the homozygous recessive condition. The results in this experiment support the hypothesis that was made since the allele frequency and genotypic frequencies remained constant from generation to generation when there was no selection, so the population was in genetic equilibrium. When selection occurred where the natural selection eliminates individuals with the homozygous recessive condition, the frequency of the recessive allele declines from generation to generation, but the allele is not completely eliminated because it is masked in individuals with the heterozygous condition. Problem: What is the effect of natural selection on allele and genotypic frequencies? Introduction: This experiment shows genetic equilibrium and the use of the Hardy-Weinberg law to describe allele frequencies in populations. Genetic equilibrium occurs when frequencies of alleles remain constant from generation to generation. In order to be in genetic equilibrium, five conditions have to be met: no mutations, no natural selection, no gene flow (no migration), large populations (no genetic drift), and random mating. This experiment compares a population that is in equilibrium to a population undergoing natural selection against the homozygous recessive condition. Two equations will be used, p+q=1 and p 2 +2pq+q 2 =1. If these two equations are true, then the population is in genetic equilibrium. These variables in these equations will help us find: p – dominant allele frequencies q – recessive allele frequencies 2pq – frequency of heterozygous p 2 - frequency of homozygous dominant q 2 - frequency of homozygous recessive This will show if the population is in genetic equilibrium. Brown is the recessive trait (ff) while orange will be the dominant trait (F_) in this experiment. Experimental Design:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2011 for the course BIOLOGY 101 taught by Professor Martin during the Spring '08 term at Rutgers.

Page1 / 4

Lab 8 akp biology - Akshay Patel 01/20/2010 Period 1 Lab 8:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online