If a characteristic which is influenced by genes and passed from parents to offspring is called a heritable trait, for example, fur color is a heritable trait for rats. An adaptation is a heritable trait that increases fitness. This table describes the characteristics of a population of rats living on gray sand.

color of fur white gray black
Av. run speed 4 cm/s 6 cm/s 12 cm/s
Av. # of offspring 4 16 10
Av. age at death 3 months 6 months 3 months

a. Which fur color is an adaptation for these mice? What evidence supports your conclusion?

b. Explain what the data is showing an what conclusions can you draw from it?

c. Predict what the population would be like for each rat if the sand turned black.

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?

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Blank is a rock with a find dark texture that makes up the oceanic crust