A population is reproductively isolated. Which of the following is primarily responsible for the introduction of new alleles at genetic loci into the population? (a)Independent assortment during meiosis (b)Germ line mutations (c)Assortive mating (d)Inbreeding (e)Somatic cell mutations   2. A haplotype in a given chromosomal region will be passed on […]

1. Describe the regulation of the trp operon (a) in the presence of tryptophan and (b) the absence of tryptophan. Name all components involved and tell where they bind. 2. What is the function of the lac operon? 3. Describe how the lac operon is regulated by both lactose levels […]

1. Mary noticed a large, brown spot on her skin. She has been playing tennis in the sun for several years without sun protection. She reported the discovery to a friend, who told her to apply the ABCD rule to determine whether or not she had malignant melanoma. Her friend […]

The mitotic index is defined by the following ratio: [Number of cells undergoing mitosis]/[total number of cells present]. Identify three normal human adult cells/tissues in which the mitotic index is very high and three normal human adult cells/tissues in which the mitotic index is very low or zero. For each, […]