If a DNA molecule containing the base sequence 5′ TACTAG 3′ unzipped during replication, and replication that occurred in the direction away from the replication fork (to right) proceeded in three-base sequences, what would be the FIRST three-base sequence to be formed? A. 5′ ATG 3′ B. 3′ ATC 5′ […]

Pyrethrum is an African plant that develops daisy-like flowers with white petals and yellow centers. The chemical pyrethrin is produced in large amounts in the flower buds. Pyrethrin is a very strong poison that shuts down the nervous system of insects. This chemical is used as spray to kill insects […]

Question: In humans the presence of chin and cheek dimples is dominant to the absence of dimples, and the ability to taste the compound PTC is dominant to the inability to taste the compound. Both traits are autosomal, and they are unlinked. The frequencies for dimples are D = 0.62 and […]

Mutations in the rII region of a bacteriophage T4 prevent its growth on E. coli strain K. You obtain numerous mutations in this region and want to determine how many genes are located there. You perform double infections of E. coli K with the different pairwise combinations of mutations both […]