The study of escherichia coli (e. coli) led researchers to new experimental designs for studying operons. which experimental design did the scientists use?
a. use a microscope to observe cell division to determine the structure of operons.
b. test the response of e. coli to a variety of chemicals to determine the number of operons that are present.
c. insert the operons from one organism into another to determine the mechanism of operon expression.
d. read the genome sequence to determine the quantity and organization of operons.

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

The body of water found at number 4 on the map above is the