1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vadim26 [7]
3 years ago
9

A student argues that being separated geographically is the only way for speciation to occur. Why is he wrong?

Biology
2 answers:
Mashutka [201]3 years ago
5 0
Causes of speciation
<span>Geographic isolation
In the fruit fly example, some fruit fly larvae were washed up on an island, and speciation started because populations were prevented from interbreeding by geographic isolation. Scientists think that geographic isolation is a common way for the process of speciation to begin: rivers change course, mountains rise, continents drift, organisms migrate, and what was once a continuous population is divided into two or more smaller populations.

</span>Reduction of gene flow
<span>However, speciation might also happen in a population with no specific extrinsic barrier to gene flow. Imagine a situation in which a population extends over a broad geographic range, and mating throughout the population is not random. Individuals in the far west would have zero chance of mating with individuals in the far eastern end of the range. So we have reduced gene flow, but not total isolation. This may or may not be sufficient to cause speciation. Speciation would probably also require different selective pressures at opposite ends of the range, which would alter gene frequencies in groups at different ends of the range so much that they would not be able to mate if they were reunited.</span>
katrin [286]3 years ago
5 0

Answer:

He is wrong because speciation can occur by reproductive isolation as well which does not require geographical isolation.

Explanation:

Speciation occurs through reproductive and geographical isolation. Separation of two populations by ant geographical barriers followed by accumulation of genetic variations in response to local climatic conditions leads to reproductive isolation, that is, speciation.  

However, sympatric speciation occurs when two population living together in the same habitat. These populations are not allowed to interbreed due to the structural or behavioral mechanism of reproductive isolation.  

You might be interested in
Which group of algae is believed to be the ancestor of land plants?
ycow [4]

Answer:

<u>stonewort, and many green algae such as the Spirogyra.</u>

Explanation:

  • As it was believed that the land algae were believed to be evolved from the stonewort plant and the blue-green algae like the cyanobacteria and the spirogyra that colonized the lands some 500 mn years ago was a freshwater alga.
  • After which the first land plants occur about 470 million years ago, and they were in the form s of moss and liverworts of the vascular in origin.
7 0
3 years ago
The insurance hypothesis suggests biodiversity will ensure Earth against extinctions in the future.
Mademuasel [1]

The correct answer is True.

4 0
3 years ago
Which direction do new york state weather systems usually approach from
Rudiy27

Answer:

west to east

Explanation:

The weather system of New York moves in the west to east direction. It is driven by the jet stream which moves from west to east.

The jet stream is nothing but the normal trade winds  that blows in and around the equator and move from west to east. While very strong wind forces start blowing from east to west due to the tropical trade winds

4 0
3 years ago
Cholera bacteria are infected with a virus that would be called
Alekssandra [29.7K]

Answer:

Cholera is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. Symptoms may range from none, to mild, to severe.

5 0
3 years ago
benedict's solution contains copper(2) sulphate (blue). the copper (2) salt can be reduced to a red precipitate of copper (1) ox
Anna35 [415]

Answer:

I don't know

Explanation:

But I know

7 0
3 years ago
Other questions:
  • Ribosomal RNA is produced by _____.
    14·2 answers
  • What happens in a chloroplast?
    12·2 answers
  • Small secondary lymphoid organs, which cluster along lymphatic vessels, are termed ________.
    9·1 answer
  • Which organelle transfers the energy in glucose into molecules of ATP?
    7·1 answer
  • All of the following may help begin an ice age EXCEPT _____.
    13·1 answer
  • Trna with the anticodon 3′-acg-5′ brings _____ amino acid during translation. Please submit your answer with three letters.
    5·1 answer
  • Plz help i have attachment file
    5·1 answer
  • Surprisingly, whales have hind limbs (leg bones) that they do not use, but that are thought to be left over from an earlier ance
    13·1 answer
  • Which characteristic of a protein may change during a DNA mutation?
    15·2 answers
  • The lowering of the overall demand for a resource is called _____.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!