Question 1

Speciation cannot occur without geographic isolation.

Accepted Answer

Speciation can occur without geographic isolation through sympatric speciation, where two populations evolve into separate species within the same geographical area. This can occur through mechanisms such as polyploidy, sexual selection, or ecological specialization.

Question 2

The offspring of two individuals of different species that interbreed are known as _____________.

Accepted Answer

The answer of The offspring of two individuals of different...

Question 3

Pre- and postzygotic barriers can keep species ________ isolated from each other, even if they live in the same area.

Accepted Answer

The answer of Pre- and postzygotic barriers can keep species...

Question 4

__________ barriers cause speciation to occur by preventing fertilization from occurring when two individuals of different populations attempt to mate.

Accepted Answer

The answer of __________ barriers cause speciation to occur by...

Question 5

An ecological ________ can limit a population's ability to adapt to its environment, as the organisms must compromise between what is possible developmentally and what is possible genetically.

Accepted Answer

The answer of An ecological ________ can limit a population's...

Question 6

The population of salamanders, a _______ species found along the Pacific coast of the United States, forms a circle around a desert-like valley. Neighboring salamander species mate, but those on opposite sides of the valley do not.

Accepted Answer

The answer of The population of salamanders, a _______ species...

Question 7

Speciation generally occurs at a ________ rate.

Accepted Answer

The answer of Speciation generally occurs at a ________ rate....

Question 8

Adaptations result from natural selection.

Accepted Answer

Adaptations are traits or behaviors that make an organism better suited to its environment. Natural selection favors organisms with helpful adaptations, allowing them to survive and reproduce more successfully than those without them. Over time, this process leads to the evolution of new species that are better adapted to their habitats.

Question 9

A biological species is a group of interbreeding populations that is ________ isolated from other species of organisms living in the same region.

Accepted Answer

The answer of A biological species is a group of...

Question 10

The great diversity of life on Earth is caused by ________-the formation of new species.

Accepted Answer

The answer of The great diversity of life on Earth...

Question 11

Sympatric speciation can occur in the absence of geographic isolation.

Accepted Answer

Sympatric speciation occurs when a population diverges and forms a new species within the same geographic area, without any physical barriers preventing gene flow. This can occur through mechanisms such as polyploidy, habitat differentiation, or sexual selection.

Question 12

Two species live near each other but do not respond to each other's courtship displays. This is an example of ________ isolation, a type of prezygotic barrier.

Accepted Answer

The answer of Two species live near each other but...

Question 13

_________ speciation occurs when a new species arises in the absence of geographic isolation.

Accepted Answer

The answer of _________ speciation occurs when a new species...

Question 14

When speciation is caused by a rapid change in chromosomal number such as ________, new species form in a single generation.

Accepted Answer

The answer of When speciation is caused by a rapid...

Question 15

An organism is polyploid if it has more than two complete sets of ________.

Accepted Answer

The answer of An organism is polyploid if it has...

Question 16

Gene flow prevents two populations from becoming genetically different.

Accepted Answer

The answer of Gene flow prevents two populations from becoming...

Question 17

Geographic isolation can result in speciation but usually only over long periods of time.

Accepted Answer

Geographic isolation can result in speciation, as it can prevent gene flow between populations, leading to genetic divergence and eventual reproductive isolation. However, this process usually takes a long time, as it requires the accumulation of genetic differences over many generations.

Question 18

The death of zygotes produced by the mating of individuals of two different populations is an example of how ___________ barriers can lead to reproductive isolation.

Accepted Answer

The answer of The death of zygotes produced by the...

Question 19

Speciation can occur when populations of a species are separated by a barrier becoming ________ isolated and subsequently become reproductively isolated from one another.

Accepted Answer

The answer of Speciation can occur when populations of a...

Question 20

Humans have directed the evolution of other organisms.

Accepted Answer

Humans have selectively bred certain species or manipulated their genes through genetic engineering, leading to intentional changes in their evolution.

Quiz 18: Adaptation and Speciation