question archive Which of the following statements is NOT true?   a

Which of the following statements is NOT true?   a

Subject:BiologyPrice: Bought3

Which of the following statements is NOT true?

 

a.Both transformation and divergence (pathways to speciation) are the result of natural selection

 

b,Behaviour is a geographical barrier that can keep the species reproductively isolated

 

c,Biological species can be described as being reproductively isolated from other species

 

d,If populations remain isolated long enough, speciation will eventually occur because of changes accumulated in the population due to natural selection, which affects reproduction

 

 

 

2,Grand Canyon

 

The Grand Canyon in Arizona serves as a barrier to gene flow. While birds easily cross the Grand Canyon, it is impassable to rodents. As a result, the same bird species inhabit either side of the canyon, yet different species of squirrels inhabit opposite sides of the canyon.

With respect to the different populations, the Grand Canyon is

Question 29 options:

 

a,a biological barrier to the squirrels

 

b,a biological barrier to the birds

 

c,a geographical barrier to the birds

 

d,a geographical barrier to the squirrels.

 

3.Pre-zygotic Barriers

A  Pre-zygotic barriers (also known as pre-fertilization barriers) either impede mating between species or prevent fertilization of the ovum (egg) if individuals from different species attempt to mate.

 

Post-zygotic Barriers

B  In some cases, the sperm of one species successfully fertilizes the ovum of another species and the zygote (fertilized egg) is produced. However, there are several post-zygotic (post fertilization) barriers that prevent these hybrid zygotes from developing into normal, fertile individuals

 

Barriers to Reproduction

1   Behavioural isolation: Any signals or behaviours that are species-specific prevent interbreeding in closely related species. For example, bird species that look virtually identical (such as meadowlarks) can remain separate biological species.

 

2   Hybrid inviability: Genetic incompatibility of the interbred species may stop development of the hybrid zygote at some stage during embryonic development. For example, hybrid embryos created artificially between sheep and goats die early in their developmental stages, before birth.

 

3   Habitat isolation: Although two species may live in the same general region, they may live in different habitats and rarely, if ever, encounter each other.

 

4   Temporal isolation: Many species are kept separate by temporal (timing) barriers. For example, two species may occupy the same habitat but mate or flower at different times of the day, different seasons, or in different years.

 

5   Hybrid sterility: Sometimes two species can mate and produce hybrid offspring (such as a horse and donkey producing a sterile mule or hinny). However, a reproductive barrier still exists between the two species if the hybrid offspring is sterile.

 

6         Mechanical isolation: Species that are closely related may attempt to mate but fail to achieve fertilization because they are anatomically incompatible. For example, the genitals of some species of insect operate in a lock-and-key system. If a male and female of different species attempt to breed, their genitals will not fit together

Match the pre-zygotic barriers (A) to the barriers to reproduction identified by the numbers above. Record your answer from lowest to highest numeric order in the answer space.

 

Barriers to Reproduction: _____ _____ _____ _____

Pre-zygotic Barriers (A)

pur-new-sol

Purchase A New Answer

Custom new solution created by our subject matter experts

GET A QUOTE