Exercise 3 The Founder Effect 1 (93.7 KiB) Viewed 9 times
Exercise 3 The Founder Effect 2 (67.64 KiB) Viewed 9 times
Exercise 3 The Founder Effect 3 (40.54 KiB) Viewed 9 times
Work in a small group to complete this exercise. In this exercise, you will simulate a case of the founder effect. STEP 1 Gather your lab materials. You should have: . 1 cup (which will hold the alleles for an en- tire population-the gene pool) • 20 red beans (representing the dominant al- lele (R) for a simple Mendelian trait) • 20 white beans (representing the recessive allele (r) for the same trait) Note: You may substitute other everyday objects (such as candies, coins, or paper clips) for the beans, but be sure to designate which objects represent the dominant versus recessive alleles. STEP 2 Assess the gene pool. 200 1. How many alleles of each type are present in your overall population? STEP 3 Select the subpopulation that will sur- vive an ecological catastrophe. Randomly draw out five genotypes (pairs of beans) that will sur- vive. Record the genotypes of these five individ- uals in the chart below. Remember to use the cor- rect alleles (R and r). 00 00 00 00 00 Individual Your genotype pairs should be laid out like this for 5 individuals (pairs), but the specific alleles (bean types) will vary depending on how you randomly pull them from the cup. Genotype
1 2 3 4 5 2. How many alleles of each type are rep- resented in this surviving population (the founders)? 201 3. As this surviving population mates, and the population increases again, will it differ from the original, larger population? Why or why not? STEP 4 Select a second subpopulation that will survive another catastrophe. Return your alleles (beans) to the gene pool (cup). Now, let's say that only two individuals survive. Randomly draw out two genotypes (pairs of beans) that will sur- vive. Record the genotypes in the chart below. Remember to use the correct alleles (R and r). Individual 1 Genotype
2 4. How many alleles of each type are repre- sented in this surviving population? 5. Does this group of founders differ from the first group of founders above? Why or why not? 202 6. Does this group of founders differ from the original, larger population? Why or why not? 7. How might the size of the founding group affect genetic drift?
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