Start with a beaker containing 25 Red beads (S) and 25 Blue beads (s). Randomly

Question

Start with a beaker containing 25 Red beads (S) and 25 Blue beads (s). Randomly remove 10 pairs of beads, recording what each pair is (e.g., SS, Ss or ss). Enter this information in the table below where it says “Genotypes drawn”. Discard any of the ss pairs and return the rest to the beaker. Count how many Red and Blue survived and place twice that many back into the beaker. Repeat this process seven times.

1 2 3 4 5 6 7
Alleles to start Alls start Alls start Alls start Alls start Alls start Alls start

S 25

s 25

Genotypes drawn Geno drn Geno drn Genos drn Gens drn Genos drn Gens drn
SS

Ss

ss




Questions

1. What is the final count of genotypes in your last trial?

SS _______

Ss _______

ss _______

2. Have any genotypes been selected against? If yes, which one(s)?


3. What are the final counts of the two alleles in your last trial?

Red (S) : ____________ Blue (s) : ____________

Given enough generations, would you expect one of these alleles to completely disappear from the population? Why or why not?



4. Would this be different if you started with a larger population? Smaller?




5. Unlike the results we saw in this experiment, the sickle cell allele (s) remains quite high populations of those with African Ancestry. Furthermore, the worldwide distribution of the sickle cell gene matches very closely to the worldwide distribution of Malaria. How might you explain these two observations? See p 265 in your book if you are unsure.

Explanation / Answer

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