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
forsale [732]
2 years ago
12

Which situation allows for evolution during gene duplication?

Biology
1 answer:
alexira [117]2 years ago
6 0
The first step in DNA replication is to ‘unzip’ the double helix structure of the DNA molecule. This is carried out by an enzyme called helicase which breaks the hydrogen bonds holding the complementary bases of DNA together. The separation of two single strands of DNA creates a ‘Y’ shape called the replication ‘fork’. The two separated strands will act as templates for making the new strands of DNA. One of the strands is oriented in the 5’ to 3’ direction (towards the replication fork), this is the leading strand. The other strand is oriented in the 3’ to 5’ direction (away from the replication fork), this is the lagging strand. As a result of their different orientations, the two strands are replicated differently.

For the leading strand:
A short piece of RNA called primer (produced b an enzyme called primase) comes along and binds to the end of the leading strand. The primer acts as the starting point for DNA synthesis. DNA polymerase binds to the leading strand and then ‘walks’ along it, adding new complementary nucleotide bases to the strands in the 5’ to 3’ direction. This is called continuous.  

For the lagging strand:
Numerous RNA primers are made by the primase enzyme and bind at various points along the aging strand. Chunks of DNA called Okazaki fragments are then added to the lagging strand also in the 5’ to 3’ direction. This type of replication is called discontinuous as the Okazaki fragments will need to be joined up later.  
<span>
Once all the bases are matched up, an enzyme called exonuclease strips away the primer(s). The gaps where the primer(s) were are then filed by yet more complementary nucleotides. The new strand is proofread to make sure there are no mistakes in the new DNA sequence. Finally, an enzyme called DNA ligase seals up the sequence of DNA into two continuous double strands. During the zipping up of the DNA molecule, there is a possibility that the pairing of bases get shuffled and thus cause for mutation. The result of DNA replication is two DNA molecules consisting of one new and one old chain of nucleotides. The answer is C.</span>
You might be interested in
The most biologically devastating oil spills in the marine environment are usually a result of?
lions [1.4K]

The most biologically devastating oil spills in the marine environment are usually a result of the sinking of oil tankers.

An oil spill is a type of pollution that occurs when a liquid petroleum hydrocarbon is released into the environment, particularly the marine ecology.

Oil releases into the sea or coastal waterways are generally referred to as marine oil spills, however land-based spills are also possible.

Oil spills can result from crude oil discharges from tankers, sinking of oil tankers, offshore platforms, drilling rigs, and wells as well as refined petroleum products (like gasoline and diesel) and their byproducts, heavier fuels used by big ships like bunker fuel, or the spill of any oily waste or garbage.

Learn more about oil spills here brainly.com/question/12558255

#SPJ4

8 0
1 year ago
The _____________ of a flower develops into the fruit.
sdas [7]
The SEED of a flower develops into the fruit
6 0
3 years ago
Why are mushrooms important to the food chain?
Arisa [49]
<span>It breaks down and decomposes dead animal and plants.</span>
3 0
3 years ago
Read 2 more answers
What is the primary function of the parathyroid gland
NISA [10]

Answer:

it regulates the calcium levels in the blood

Explanation:

6 0
2 years ago
Read 2 more answers
Two structures play an important role in the way that birds digest food.
adelina 88 [10]

Answer:

Gizzard and crop

Explanation:

I just answered that question.

4 0
3 years ago
Other questions:
  • Aquatic organisms that lived hundreds of millions of years ago and were buried in silt and sediment resulted in the formation of
    6·2 answers
  • The current understanding of created "kinds" is:
    6·1 answer
  • which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait
    8·2 answers
  • Some muscle cells have the ability to produce more mitochondria if they are involved in regular exercise. Which answer correctly
    11·2 answers
  • As the population of small fish in a lake decreases, the population of large fish that depend on the small fish for food will __
    10·1 answer
  • When setting up an experiment why is it necessary to have a control group
    9·2 answers
  • What are Earth's ten biomes? A) tundra, taiga, grasslands, deciduous forest, chaparral, desert, desert-scrub, savanna, rainfores
    9·2 answers
  • Where would a frameshift mutation cause the most damage?
    8·1 answer
  • Help pls :(( it would help me alot
    6·1 answer
  • Which does the termination of translation require?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!