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Chapter 25: Problem 14
In a population of 10,000 individuals, where 3600 are \(M M\) 1600 are \(N N,\) and 4800 are \(M N,\) what are the frequencies of the \(M\) alleles and the \(N\) alleles?
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List the barriers that prevent interbreeding and give an example of each.
In a population of cattle, the following color distribution was noted: \(36 \%\) red \((R R), 48 \%\) roan \((R r),\) and \(16 \%\) white \((r r) .\) Is this population in a Hardy-Weinberg equilibrium? What will be the distribution of genotypes in the next generation if the Hardy-Weinberg assumptions are met?
In a population of 10,000 individuals, where 3600 are \(M M\) 1600 are \(N N,\) and 4800 are \(M N,\) what are the frequencies of the \(M\) alleles and the \(N\) alleles?
Price et al. (1999. J. Bacteriol. 181: 2358-2362) conducted a genetic study of the toxin transport protein (PA) of Bacillus anthracis, the bacterium that causes anthrax in humans. Within the 2294 -nucleotide gene in 26 strains they identified five point mutations-two missense and three synonyms-among different isolates. Necropsy samples from an anthrax outbreak in 1979 revealed a novel missense mutation and five unique nucleotide changes among ten victims. The authors concluded that these data indicate little or no horizontal transfer between different \(B\). anthracis strains. (a) Which types of nucleotide changes (missense or synonyms) cause amino acid changes? (b) What is meant by horizontal transfer? (c) On what basis did the authors conclude that evidence of horizontal transfer is absent from their data?
A farmer plants transgenic Bt corn that is genetically modified to produce its own insecticide. Of the corn borer larvae feeding on these \(\mathrm{Bt}\) crop plants, only 10 percent survive unless they have at least one copy of the dominant resistance allele \(B\) that confers resistance to the Bt insecticide. When the farmer first plants Bt corn, the frequency of the \(B\) resistance allele in the corn borer population is \(0.02 .\) What will be the frequency of the resistance allele after one generation of corn borers fed on Bt corn?
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