Darwin's Theory Quiz 90%

According to the concept of "survival of the fittest," if a population of birds eats worms that they find deep under ground by using their beaks, which members of the bird population would be more fit? birds that have flatter beaks birds that have longer beaks birds that have wider beaks birds that have brighter beaks

B

Consider this image of a gazelle.Which of the gazelle's naturally selected traits is shown in this picture to be an evolutionary advantage? feeding only at certain times of the day coat color for blending in with dry grass specialized gut due to a diet of grasses specific gender roles to diminish predation

B

Which statement describes natural selection? It is the primary mechanism for evolution. It must act on structural traits. It acts to cause overpopulation. It causes learned skills to become heritable traits.

A

A population of rabbits has individuals with fur coloring that ranges from white to brown. The population lives in a temperate deciduous forest where the summers are mild and average about 50°F. The winters are often below freezing.If warmer temperatures last longer into the fall and the average temperature in the winter is getting warmer, what do you expect to happen to the population? The percentage of the population with brown fur will decrease. The percentage of the population with white fur will decrease. The population will increase in size, but the color percentages will remain unchanged. The population will decrease in size, but the color percentages will remain unchanged.

B

The map shows the allele frequency of sickled hemoglobin (HbS) and malaria endemicity in Africa.Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa? When an area is malaria free, the HbS allele frequency is between 0 and 4.04. When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04. When an area is malaria free, the HbS allele frequency is between 12.64 and 18.18. When an area is holoendemic, the HbS allele frequency is between 0 and 0.51.

B (?)

In the African savanna, more wildebeests are born than the environment can support. Which is most likely to happen over a period of years as a result? The chances for survival of the population are reduced. New food sources are discovered and become the regular diet. Individuals that are well suited to the environment reproduce, and those that are not well suited die before they reproduce. The environment adapts by providing more resources to the growing population, increasing the chances of survival for individuals within the habitat.

C

Which statement would least likely be used to describe variation? Variations are inherited differences between individuals of the same species. Variations that decrease reproductive success are more likely to be passed on. Variations may result in changes to an entire population after many generations. Variations provide some individuals with an advantage.

C

Natural selection is a process by which organisms that are better adapted to their environment tend to increase in size. migrate. evolve new traits. survive.

D

Which was Charles Darwin's contribution to the study of biology? He was the first person to recognize that organisms change over time. He believed that organisms adapted through the inheritance of acquired traits. He explained how traits are passed from parents to offspring. He proposed that natural selection is the primary mechanism of evolution.

D

Which organism exhibits behavioral adaptation? an owl with large pupils and eyes that enable it to see better at night a possum playing dead to increase its chances of survival an insect that mimics its environment to hide from its predators a desert plant that sheds its leaves to lessen water loss during the dry season

B