34) In an annual grass, Deschampsia bopotheticus, tolerance to heavy metals is c

Question

34) In an annual grass, Deschampsia bopotheticus, tolerance to heavy metals is controlled by a single locus, and the tolerant allele is dominant to the non-tolerant allele of tolerant and non-tolerant seeds in contaminated soil in the lab. The number of surviving adul t plants is tabulated below. Calculate the fitness of each tolerance phenotype (2 marks) Phenotype Tolerant 300 Non-tolerant 300 80 Seeds Planted ) The tolerant allele had a frequency of 0.20 in a population in clean soil, and was in Hardy- Weinberg equilibrium. One winter the soil became contaminated due to the dumping of mine tailings. Use the fitness values from part A) to estimate the frequency of the tolerant allele after one generation on the contaminated soil. 4 marks)

Explanation / Answer

34) A) Fitness of each tolerance phenotypes:

Tolerant allele:

240 / 300 X 100 = 80%

Non-tolerant allele:

80 / 300 X 100 = 26.66%

35) Tolerant allele has a frequency of 0.20 in the population of clean soil.

So, according to Hardy-Weinberg equation p2 = 0.20

P = 0.447

Q= 1-0.447 =0.552

From table A, we estimated the fitness of tolerant allele in contaminated soil is 80%.

So, in contaminated soil, after one generation, the frequency of tolerant allele would be:

80% of 0.20 = 0.16

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