Case: In early July a 34-year-old infected male housed in a state correctional facility was taken to the prison hospital with a two-week history of fever, abdominal pain, and cough.  His chest radiograph was normal, and sputum samples were negative for acid-fast bacteria. The inmate was returned to the prison […]

Question: Consider the first copy of an allele for insecticide resistance that arises by mutation in a population of insects exposed to an insecticide. a) Is this mutation an adaptation? b) If, after some generations, we find that most of the population is resistant, is the resistance an adaptation? c) If we discover […]

1. Did all the bacterial colonies on the countable plate(s) have a similar appearance? If not, how do you explain this 2. What is the formula for population density? Explain what each part of the equation means. 3. What errors can occur while performing a serial dilution / direct plate […]

125 progeny were produced from the following cross: aaBbCcDd x AaBbccDD. Assume that all the genes are unlinked, and that the uppercase letters represent dominant alleles. a) How many offspring are expected to express the dominant phenotype for each gene? b) how mant offspring are expected to have the genotype […]