an example of a single-gene trait is

a. bands on a snail’s shell.
b. beak size in the galápagos finches.
c. length of snails.
d. fur color in cats.

which of the following explains why the edges of africa and south america fit together like two pieces of a puzzle?

a. endosymbiosis
b. biological forces
c. continental drift
d. none of the above

Name the type of chemical that speeds up digestion

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening

Fredrick griffith made a scientific discovery in 1928