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
You are told that an atom has 10 electrons how many protons does it contain
Alex_Xolod [135]
No of electrons is equal to no of protons so it will have 10 protons
7 0
3 years ago
What polysaccharide do plants store in plastids
Alik [6]
There are three common and principal types of polysaccharide, these are the cellulose, starch and glycogen. They are<span> all made by joining together molecules of glucose in different ways. 
</span><span>The polysaccharide that plants store in plastids is starch.</span>
4 0
3 years ago
Read 2 more answers
16. An organ system is a group of organs that (2 points)
True [87]

Answer:

Organ systems are organs that work together to perform a specific bodily function, so your answer is D

Explanation:

6 0
3 years ago
Please help whoever’s right will get brainliest
hodyreva [135]

Answer:

1: LAW

2: THEORY

3: THEORY

4: THEORY

Explanation:

7 0
3 years ago
How certain do you feel that the theory of plate tectonics is correct? What evidence would you use to support your opinion?
nika2105 [10]

Answer: I feel that the theory of plate tectonics is correct, because we use friction every day which means friction could make vibrations larger too!

4 0
3 years ago
Read 2 more answers
Other questions:
  • What takes place in G1 stage of the cell cycle
    8·2 answers
  • What is the steps for an osteogenic to undergo mitosis?
    12·1 answer
  • Mirror neurons are believed by some scientists to provide a biological basis for:
    7·1 answer
  • Viruses that infect prokaryotes are called ____<br> The choices are<br> Virions, phages, or capsids
    15·1 answer
  • 1 point
    10·2 answers
  • Suppose the students are caught in a sudden storm how can they stay safe during the storm
    9·1 answer
  • how does the skeletal system help the body maintain homeostasis? if it doesn't function correctly how does it affect the body?
    11·1 answer
  • Which of the following events happens during anaphase?
    8·1 answer
  • A female brine shrimp can lay up to 150 eggs each time, whereas some other animals, such as penguins only lay 1 or 2 eggs. Based
    10·1 answer
  • Which result is consistent with the intestine actively transporting glucose from mucosal to serosal side, with a critical need f
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!