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Application of an insecticide to control mosquito populations in malaria infested areas quickly resulted in a dominant mutation, R, resulting in insecticide resistance. However, the mutation also reduces the fertility of RR homozygotes. The fitness of different genotypes in areas where the insecticide is in use, are as follows:
rr (susceptible) 0.35Rr (resistant) 1.0RR (resistant) 0.85
What is the equilibrium frequency of the R allele in the population? Using the fitness values in the previous problem, and a starting frequency of 1% for the R allele, what is the expected frequency of the R allele after one generation in an environment where the insecticide is applied?
Illustrate the metaphase cell of this culture showing predicted distribution of radioactivity on the autoradiograph.
Which vitamin is essential for the formation of bones.
Injection of double stranded RNA can lead to gene silencing by degradation of RNA molecules complementary to either strand of the dsRNA.
A woman is heterozygous for three X-linked loci: AaBbDd. She has seven sons with the following genotypes: Two are X aBd Y Three are X abD Y One is X ABD Y One is X Abd Y.
What are two natural causes of DNA mutations, besides DNA replication errors. Briefly explain what happens to the DNA and how replication accuracy is affected.
In humans the presence of chin and cheek dimples is dominant to absence of dimples, and ability to taste the compound PTC is dominant to the inability to taste the compound.
Mark-recapture Largemouth bass data from the Des Plaines River. Use these information, estimate the density (number/hectare) of each size class plus the overall density.
Which of the following best characterizes membrane structure.
When oxygen moves from outside the body to inside the body to, for example, your toe, what are the names of the arteries and veins it goes through?
If a trait had a broad-sense heritability of 1, what would it mean? 0.5? 0? What type of traits has a broad-sense heritability of 1? What type of traits has a heritability of zero?
In allosteric deactivation a regulatory molecule binds to a site other than the active site, resulting in a change in enzyme shape that allows the active site to bind substrate.
Predict and explain the action of each of the following concentrations on the Tm of native DNA.
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