Question 1

An island has a population of 10,000 birds that has 98% gray individuals and 2% black individuals.Generation after generation,this ratio and population size remains basically the same.After a hurricane,10,000 black birds are blown onto the island.What will happen to the population?

Accepted Answer

The answer of An island has a population of 10,000...

Question 2

Red-cockaded woodpeckers live in mature open pine forest with little understory.One aspect of managing this endangered species is trying to connect isolated populations with corridors of appropriate habitat.Why is this important?

Accepted Answer

The answer of Red-cockaded woodpeckers live in mature open pine...

Question 3

Why is inbreeding likely to limit the ability of a population to survive?

Accepted Answer

The answer of Why is inbreeding likely to limit the...

Question 4

Which of the following best describes Hardy-Weinberg equilibrium?

Accepted Answer

Hardy-Weinberg equilibrium represents a population that is not evolving, meaning that the allele frequencies and genotype frequencies will remain constant from generation to generation if certain conditions are met (such as no mutations, no migration, random mating, no natural selection, and a large population size).

Question 5

Reproductive isolation based on location or geography is referred to as

Accepted Answer

Ecological isolation is reproductive isolation based on location or geography. This can occur when two species live in different habitats or ecological niches and therefore never come into contact with one another to mate.

Question 6

From the Hardy-Weinberg equilibrium you can conclude that all populations are evolving.  Explain.

Accepted Answer

The answer of From the Hardy-Weinberg equilibrium you can conclude...

Question 7

Mating rituals are an example of which type of reproductive isolation?

Accepted Answer

Mating rituals are an example of behavioral isolation, which refers to differences in behavior and courtship rituals that prevent members of different species from mating successfully.

Question 8

An island has a population of 100,000 moths that has 98% gray individuals and 2% black individuals.Generation after generation,this ratio and population size remains basically the same.After a hurricane,15,000 black moths are blown onto the island.After 2 years,

Accepted Answer

The introduction of 15,000 black moths will increase the percentage of black moths in the population, shifting the ratio from 98% gray and 2% black. However, it is unlikely that all of the black moths will be killed off or that they will emigrate back to their original habitat. The introduction of black moths may also lead to natural selection favoring the black moths in the population.

Question 9

A population of Australian wallabies is found to have many more homozygous individuals than expected.What does this result indicate?

Accepted Answer

The excess of homozygous individuals indicates that there is a high probability of inbreeding occurring in the population. Inbreeding can lead to a decrease in genetic diversity and an increase in the expression of deleterious recessive traits, which can negatively affect the population's health in the long term.

Question 10

Incompatibility of mating organs is an example of which type of reproductive isolation?

Accepted Answer

Mechanical isolation occurs when differences in the size and shape of reproductive organs prevent mating between species, making it an example of prezygotic barrier to reproduction.

Question 11

The biological species concept defines a species as

Accepted Answer

The biological species concept defines a species as a group of organisms that can interbreed and produce fertile offspring. This means that members of a population must be able to mate and produce viable, fertile offspring in order to be considered part of the same species. Option A is incorrect because not all individuals in a population may be fertile, but they can still be part of the same species if they can breed with fertile individuals. Option B is incorrect because if individuals can only interbreed in isolation, it does not necessarily indicate that they are part of the same species. Option C is incorrect because populations can be isolated from each other and still belong to the same species if they can interbreed. Option D is incorrect because Hardy-Weinberg equilibrium refers to a theoretical state of a population and does not necessarily indicate that individuals belong to the same species.

Question 12

What five characteristics must a population have to never have a change in allele frequencies?

Accepted Answer

The answer of What five characteristics must a population have...

Question 13

An island has a population of 100,000 moths that has 98% gray individuals and 2% black individuals.Generation after generation,this ratio and population size remains basically the same.After a hurricane,10,000 black moths are blown onto the island.This is an example of _____________.

Accepted Answer

The answer of An island has a population of 100,000...

Question 14

What five characteristics must a population have to never have a change in allele frequencies? Are all five of these possible?

Accepted Answer

The answer of What five characteristics must a population have...

Question 15

Zoos often construct extensive genetic profiles of their animals,maintain pedigree books,and trade or share animals for breeding purposes.Why would a zoo with 12 elephants bother to import a male elephant from another zoo,or lend its males to another zoo,often at a huge expense?

Accepted Answer

The answer of Zoos often construct extensive genetic profiles of...

Question 16

An extremely harsh winter causes the death of 75% of an endangered antelope population.When considering the future survival of this population,which of the following is a concern for scientists?

Accepted Answer

All of the given options are concerns for scientists when considering the future survival of the population. Genetic drift may occur due to the high mortality rate, leading to a lack of genetic variation. Reduced allelic diversity and the ability to exchange genes with neighboring populations can also impact genetic variation and reduce the population's ability to adapt to changing environments. Inbreeding depression may occur among the survivors due to the small population size, which can lead to reduced genetic diversity and genetic disorders.

Question 17

Give an example of an organism that lacks mate selection.

Accepted Answer

The answer of Give an example of an organism that...

Question 18

Which of the following can threaten the ability of a population to adapt to changing environmental conditions?

Accepted Answer

All of the options (bottleneck, founder effect, genetic drift, and inbreeding) can have negative impacts on a population's ability to adapt to changing environmental conditions. Bottleneck and founder effect can decrease genetic diversity, and genetic drift and inbreeding can lead to the fixation of harmful alleles. All of these factors can reduce genetic variation and limit the pool of potentially beneficial genetic variation upon which natural selection can act.

Question 19

Frog species mate at different times of the year.This is an example of which type of reproductive isolation?

Accepted Answer

This is an example of temporal isolation because the frog species mate at different times of the year, which prevents them from interbreeding.

Question 20

A species of lizard is found on the eastern and western sides of part of a mountain range.On both sides,individual populations are small.On the western side,individual populations are relatively close together and males move extensively among populations to breed.On the eastern side,however,populations are farther apart and males seldom move among more than one or two adjacent populations to breed.If you were to study the genetic diversity of western and eastern populations,which pattern would you expect to find?

Accepted Answer

The limited male movement among eastern populations indicates restricted gene flow, which can lead to decreased genetic diversity within populations. The relatively close proximity of western populations and extensive male movement indicates increased gene flow, which can lead to greater genetic diversity within populations. Therefore, it is reasonable to expect that each western population would be genetically diverse, although the allele frequencies might differ from one population to the next. Eastern populations would be less diverse, and some populations may have only a limited number of the total alleles available in the species. Option D describes this pattern. Option A is incorrect because it suggests that the eastern populations would have fewer different alleles when this is unlikely given the species is present on both sides of the mountain range. Option B is unlikely because it proposes that each western and eastern population would have all of the available alleles, which is rare. Option C is not expected since the eastern populations are expected to have less genetic diversity due to limited gene flow. Option E is incorrect since not all patterns are equally reasonable given the information provided.

Quiz 15: A: Nonadaptive Evolution and Speciation Urban Evolution