Darwin's Theory (Quiz)

In terms of natural selection, what is the best description of an organism that is fit?

C. The organism is better able to survive and pass on traits to offspring than competing organisms.

A person with a genotype of HbSS has sickle cell disease. A person with a genotype of HbAS allele carries the sickle cell trait. A person with a genotype of HbAA does not have sickle cell disease and does not carry the trait. The Punnett square shows the genotype of two people carrying the sickle cell trait. What are the chances that their offspring will have sickle cell anemia?

25%

Which statement describes natural selection?

A. It is the primary mechanism for evolution.

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?

A. When an area is malaria free, the HbS allele frequency is between 0 and 2.02.

What is natural selection?

A. a process that selects variations that help with survival and that spreads the variations to more offspring

During a trip to the Galapagos Islands, which observation led Charles Darwin to suspect that organisms change over time?

B. Island finches resembled mainland finches, but were not the same species.

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?

B. The percentage of the population with white fur will decrease.

According to the concept of "survival of the fittest," if a population of birds eats worms that they find deep underground by using their beaks, which members of the bird population would be more fit?

B. birds that have longer beaks

Charles Darwin observed a unique beak size and shape in the finch population of each of the Galapagos Islands that he visited. Which is the most likely cause of the observed variation?

B. competition among individuals for available food sources

Scientific investigations often lead to the formulation of new scientific questions. The observations Charles Darwin's work after he returned home from his voyage and studying the selective breeding of pigeons prompted him to ask which question?

D. Can selection in nature also lead to a new species over time?

Which was Charles Darwin's contribution to the study of biology?

D. He proposed that natural selection is the primary mechanism of evolution.

Which would least likely be a cause of natural selection?

evolution

A frog has more offspring than can survive on available resources.Which behavior is this an example?

overpopulation

Natural selection is a process by which organisms that are better adapted to their environment tend to

survive.