a small polnd is being used for abreeding experimet to develop golden carp. the

Question

a small polnd is being used for abreeding experimet to develop golden carp. the single locus controlling the golden pigmenet has two codominant alleles, G and G, with phenotypes as follows: GG = Golden Gg = Bronze gg = Brown. After a number of generations of breeding, the researcher finds tha tthis population has reached genetic equilibrium, ad she can count the following individuals in the pond: Golden = 147 Bronze = 125 Brown = 28. (a) What is the frequency of the G alleles in the population? During one winter the pond is almost completely frozen, and all but 10 of the fish die. Of the remainin 10, 6 are bronze and 4 are brown. (b) What is the frequency of the G allele in this smaller population? (c) Does the difference in the frequency befroe and afehr the freeze qualify as an evolutionary change? (d) If so, what do you this is the mechanism of evolution involed in this example?

Explanation / Answer

The frequency of the G allele can be found in this way:

GG - 147 x 2 = 294

Bronze - Gg - 125

So the number of G alleles are 210. The total number of alleles are 419.

The frequency of G is 419/600 is 0.69.

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The frequency of G in the smaller population would be:

6/10 = 0.6

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The frequency is the same before and after if we take one digit as 0.6. So there is no evolutionary change.

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d. The mechanism of evolution would be maintenance of hardy weinberg equilibrium

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