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
Vanyuwa [196]
3 years ago
12

The pattern of evolution shown in the finches above is known as

Biology
2 answers:
Anton [14]3 years ago
4 0
Best choice:
C) mass evolution, as there are variety, with similar traits!
docker41 [41]3 years ago
3 0

Answer:

C.

Explanation:

Peter R. Grant  Researchers have identified genes influencing the beak size of finches such as Geospiza fortis.  Researchers are pinpointing the genes that lie behind the varied beaks of Darwin’s finches – the iconic birds whose facial variations have become a classic example of Charles Darwin's theory of natural selection.   Last year, researchers identified a gene that helps to determine the shape of the birds’ beaks1. Today in Science, they report a different gene that controls beak size2. Shifts in this gene underlay an evolutionary change that researchers watched in 2004–05, during a drought that ravaged the Galapagos Islands, where the finches live. The beak sizes of one population of finches shrank, so as to avoid competing for food sources with a different kind of finch – and their genetics changed accordingly.  “A big question was, ‘Is it possible to identify genes underlying such evolution in action, even in a natural population?’,” says Leif Andersson, a geneticist at Uppsala University in Sweden and one of the study’s authors. “We were able to nail down genes that have directly played a role in this evolutionary change.”  Evolution of Darwin’s finches and their beaks revealed by genome sequencing. The story begins about two million years ago, when the common ancestor of all Darwin’s finches arrived on the Galapagos Islands. By the time of Charles Darwin’s visit in 1835, the birds had diversified into more than a dozen species, each adapted to different ecological niches. Some had massive beaks for cracking seeds, some had delicate beaks for snatching insects, and some even had sharp beaks for feeding on blood.   To examine the genetic basis for this variation, the researchers compared the genomes of 60 birds representing six species of Darwin’s finches, along with 120 specimens from other species to help them tease out phylogenetic relationships. As expected, closely related species had the most similar genomes.   Beaks in Darwin's finches range from small insect-crunchers to large seed-demolishers. But in those six finch species one region of the genome correlated more with bird size than with relatedness. Small species had one variation of this genomic region, large species had another and medium-sized species had a mixture of the two, suggesting that at least one of the genes in this region affected size. The most likely candidate was HMGA2, which is known to affect size and face structure in other animals. Further analysis showed that in Darwin’s finches, the HMGA2 region is especially important in controlling the size of the beak.  The researchers then looked at the role of HMGA2 in a dramatic evolutionary event. After drought struck the Galapagos in 2003, many of the medium ground finches (Geospiza fortis) with larger-than-average beaks starved to death. They couldn’t compete with a bigger species (Geospiza magnirostris) that had recently colonized the island and was better at eating large seeds. After the drought, the medium ground finches that managed to survive had smaller beaks than those that had perished, probably because they were better suited to eating the small seeds that their competitors avoided.  By analyzing DNA from medium ground finches that lived around the time of the drought, the researchers found that the large-beak HMGA2 variant was more common in birds that starved to death, while the small-beak variant was more common in birds that survived. This genetic shift is likely responsible for some of the reduction in beak size, the researchers say.  The discovery opens up new questions for biologists to explore, such as when gene variants arise and how they contribute to splits between species, says Dolph Schluter, an evolutionary biologist at the University of British Columbia in Vancouver, Canada.  “On the one hand it doesn't change anything, in that we already knew there was an evolutionary response to competition during that drought,” says Schluter. “But on the other hand, it changes everything, because we can point to a physical, material basis for that change.”

You might be interested in
What is the function of Krebs Cycle please help!!!!!
Ann [662]

Explanation:

it is the final process of oxidisation for food stuff

4 0
3 years ago
An example of a biosphere is _________.
MAXImum [283]
Rock, soil, water, & air on earth!
7 0
3 years ago
Read 2 more answers
Ow might cancer stem cells can lead to the reoccurrence of turmors
Butoxors [25]

Answer:

BBC

Explanation:

Big black chicken

5 0
3 years ago
Which antibiotic was not effective against E. coli? neomycin, penicillin, erythromycin, ampicillin
qaws [65]

The antibiotic called ampicillin was not effective against E.coli.

Answer: D

Explanation:

E.coli is normal microbial flora which is present in the gut of the mammals.

It is gram negative bacteria and very few strains of this bacteria causes harm.

Antibiotics are the chemical drugs which are used to treat the microbial infection either by killing the causative organism or by its growth inhibition.

Antibiotics such as neomycin, penicillin and erythromycin are usually used to treat E.coli infection.

Antibiotic such as Ampicillin is not used as the bacterium E.coli is highly resistant to it.  

6 0
3 years ago
Which organic compound is isometric with at least one aldehyde?
BabaBlast [244]
D. functional group isomerism
8 0
3 years ago
Other questions:
  • 100 POINTS IF YOU CAN ANSWER ALL QUESTIONS!! PLUS BRAINLIEST, THANKS, RATINGS, ETC
    14·2 answers
  • A maternal effect can cause the offspring phenotype ratio to depart from that of classic Mendelian inheritance. In a species of
    13·1 answer
  • PLEASE HELP ME!! Write the following in Scientific notation. 4093cm
    7·1 answer
  • What are all organelles in cells? both animal and plant cells.?
    12·1 answer
  • Which of the following are part of the body’s first line of defense against pathogens?
    7·1 answer
  • Can someone help me with this really quick?
    13·1 answer
  • GIVING BRAINLIEST!!!!!NO LINKS!
    9·2 answers
  • Evaluate the effectiveness of legislation and facilities establishment in preventing further coral reef loss.​
    11·2 answers
  • In which situation would hydroponics be most useful for sustainable farming?(1 point)
    10·1 answer
  • Who developed a system for naming and classifying organisms that is still used today?.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!