Question 1

Sickle-cell anemia is found in highest frequencies in populations from:

Accepted Answer

The answer of Sickle-cell anemia is found in highest frequencies...

Question 2

The "system of nature" is an approach to classify all of animate and inanimate nature.

Accepted Answer

The answer of The "system of nature" is an approach...

Question 3

A sustained directional shift in a population's average characteristics is called:

Accepted Answer

Anagenesis refers to the gradual evolution or transformation of a population over time, resulting in a sustained directional shift in average characteristics. Cladogenesis refers to the splitting of a single lineage into two or more distinct species. Genetic drift refers to random fluctuations in the frequencies of alleles in a population. Speciation can result from both cladogenesis or anagenesis, but it refers specifically to the splitting of a single lineage into two or more distinct species.

Question 4

A bat's wing is homologous to a butterfly's wing.

Accepted Answer

A bat's wing is homologous to the forelimbs of other mammals, while a butterfly's wing is an analogous structure, not derived from a common ancestor.

Question 5

Genera are subdivisions of species.

Accepted Answer

Genera are higher taxonomic ranks than species, grouping together species that are closely related.

Question 6

Scientists have found that carrying sickle-cell anemia (meaning, one is heterozygous) protects the individual from:

Accepted Answer

Carrying sickle-cell anemia, even as a heterozygote, provides protection against malaria. The sickle-shaped red blood cells that result from the disease are less hospitable to the malaria parasite, making it more difficult for the parasite to survive and multiply.

Question 7

_______________ is the formation of a new species and _______________ focuses on the evolutionary relationships between species.

Accepted Answer

Speciation refers to the formation of a new species, whereas macroevolution focuses on broader evolutionary patterns and relationships between species. Therefore, choice D (Speciation/macroevolution) is the correct answer.

Question 8

In humans, climatic adaptation involves:

Accepted Answer

Climatic adaptation in humans involves both body build and cultural adaptation. For example, people living in colder climates tend to have larger body builds with shorter limbs in order to conserve heat, as well as cultural practices such as building insulated shelters and wearing warm clothing. On the other hand, people living in warmer climates tend to have leaner body builds with longer limbs to dissipate heat, as well as cultural practices such as wearing lighter clothing and living in open-air dwellings. Diet can also play a role in climatic adaptation, but it is not the only factor.

Question 9

Historical processes can shape evolutionary theory.

Accepted Answer

Historical processes such as the observation of fossils of extinct species and biogeography have influenced and continue to shape the development of evolutionary theory.

Question 10

A bat's wing is analogous to a human hand.

Accepted Answer

The answer of A bat's wing is analogous to a...

Question 11

Humans are primates.

Accepted Answer

Humans belong to the order Primates, which includes apes, monkeys, lemurs, and tarsiers.

Question 12

Evolution is the central organizing principle of the biological sciences.

Accepted Answer

Evolution by natural selection is the unifying theory that explains the diversity of life on Earth and how it has changed over time. It is the foundation of modern biology and informs many fields of study, including genetics, ecology, and medicine.

Question 13

The continuous gradation over space in the form or frequency of a genetic trait is known as a:

Accepted Answer

A cline describes the gradual variation of a genetic trait over geographical space. Homozygote refers to an individual having the same allele at a specific gene locus on both homologous chromosomes. A polygene is a set of multiple genes responsible for a complex trait. An adaptive trait is a characteristic that helps an organism survive and reproduce in its environment.

Question 14

Speciation through adaptation is generally believed to occur at a pace called:

Accepted Answer

Darwinian gradualism refers to the slow and steady accumulation of small genetic changes over long periods, leading to speciation through adaptation.

Question 15

Why does a bulky body tend to conserve more heat than a slender one?

Accepted Answer

A bulky body has more volume (mass) and less surface area (skin/cells) in proportion to its mass compared to a slender body. As heat loss occurs through the surface of the body, a smaller surface area means less heat loss to the environment, resulting in more heat being conserved in a bulkier body.

Question 16

What do we call the factors that separate two breeding populations?

Accepted Answer

The factors that separate two breeding populations are called isolating factors, which prevent interbreeding between individuals of the two populations.

Question 17

Humans are hominids.

Accepted Answer

Yes, humans belong to the family Hominidae, which includes great apes such as chimpanzees, gorillas, and orangutans.

Question 18

If two populations of primates were separated for a substantially long period of time by geographical changes, causing them, over time, to begin developing characteristics that distinguished them from each other, it could result in:

Accepted Answer

Cladogenesis is the splitting of a single lineage into two distinct lineages due to geographical isolation or other factors. In this scenario, the two populations of primates have been separated for a long time, causing genetic divergences and the development of distinct characteristics. Therefore, it is likely that cladogenesis would occur, resulting in two separate lineages. Allelic homogeneity is the opposite of genetic variation and unlikely to occur due to geographic isolation. Gene flow requires the populations to be connected, unlike the scenario given. Anagenesis refers to the gradual evolution of a lineage without bifurcation and not relevant to this scenario.

Question 19

Taxonomy is an ancient form of classification created by Linnaeus that is no longer used today.

Accepted Answer

Taxonomy is still used today as a way to classify and organize living organisms. While Linnaeus developed the system of taxonomy, it has been updated and modified over time by other scientists to better reflect our modern understanding of the relationships between different species.

Question 20

The allele for sickle-cell anemia is found primarily in areas where there are large populations of mosquitoes bearing:

Accepted Answer

The allele for sickle-cell anemia is actually a genetic adaptation to falciparum malaria. Having one copy of the gene provides some resistance to malaria, but having two copies results in the severe condition of sickle-cell anemia. The prevalence of this allele is highest in areas where falciparum malaria is endemic, such as sub-Saharan Africa, parts of India and the Middle East, and some parts of South America. Mosquitoes are the primary vector for transmitting malaria, but the other diseases listed (parasitic dysentery, smallpox, yellow fever) do not have a direct correlation to sickle-cell anemia.

Quiz 2: Biology and Evolution