You are investigating 4 recessive alleles in corn. They are whimpy ears (w), striped leaves (s), shriveled kernels (k), and red tassels (r). Their dominant counterparts are represented by the “+” symbol. A plant that is homozygous recessive for all four genes (ww ss kk rr) is crossed with a […]

Evolutionary Biology in the age of Genomics- Q1. Phylogenetic trees- You are analyzing sequences sampled from four turtle species (A-D), considering a genomic region that is 75 base pairs long. You observe the following table of the number of substitutions between pairs of species:   A B C D A […]

Drug X is used to suppress the secretion of CRH. Two patients with hypersecretion of cortisol are given Drug X. Patient A’s cortisol secretion level remains elevated, but patient B’s cortisol secretion level falls to normal levels. 1. Determine which patient has primary hypercortisolism (if any) and which has secondary […]

1. A very short physiology student is asked to measure the blood pressure of a very tall student. She decides to measure the blood pressure at the level of the tall student’s foot while he is standing (NOTE: she is not measuring blood pressure on his foot). After taking the […]