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Vinil7 [7]
3 years ago
5

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become ext

inct. Scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. However, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. These global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. In Switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. Some biologists urge the collection of the few remaining individuals of some of the most threatened amphibian species, to preserve them if they become extinct in the wild. If such captive breeding programs could produce thousands of individuals from just a few of the remaining survivors, the species will still be threatened because of ______.
Biology
1 answer:
ollegr [7]3 years ago
5 0

Answer:

a bottleneck effect

Explanation:

Genetic drift refers to the change in the allele frequencies in a population due to chance (random) events. The bottleneck effect, also known as population bottleneck, can be defined as a severe case of genetic drift caused by a drastic reduction in the population size. The bottleneck effect is well known to cause the loss of important genetic variation since alleles that were present in the original population are lost, thereby limiting its genetic diversity. One of the most common causes that may lead to a population bottleneck in a natural population is environmental disasters (e.g., earthquakes, floods, etc).

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A standard PCR cycle includes three steps: denaturation (95°C), annealing (55°C), and elongation (65°C).
xz_007 [3.2K]

Answer:

Denaturation process: The DNA template  

Annealing process: Primers  

Elongation process: dNTPs and Taq polymerase

Explanation:

For the denaturing process, the only ingredient that is required is the DNA template that will be separated from a double helix (or double strand) into a single strand, by increasing the temperature to 95 C, (at this temperature the hydrogen bonds that keep together the double stranded break). After the double strand is denatured, the following process is annealing. For this, the required ingredient are the primers; these primers will hybridize or anneal according to the nucleotide complementarity to the single strand of the DNA. Finally, for the Elongation process, you will require the Taq polymerase and the dNTPs. The enzyme will synthesize or “generate” a new strand of DNA based on the DNA template, using the provided dNTPs in the direction 5’ to 3’.

I hope this clarify you inquiry.  

6 0
3 years ago
What kind of relationship would a sea anemone and a clown fish have?
USPshnik [31]
Mutualism since the clown fish and the anemone both benefit from each other.
7 0
3 years ago
Which is the correct path of blood flow?
Nana76 [90]

Answer:

Body

— Right atrium Right ventricle - Lungs – Left atrium Left ventricle -

Explanation:

3 0
3 years ago
Why is the sky blue, when it could be any color it wants to be?
Tamiku [17]

Explanation:

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<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em> </em><em>Hope</em><em> </em><em>it </em><em>is</em><em> </em><em>helpful</em><em> for</em><em> you</em>

8 0
3 years ago
What is another word for macromolecules?
algol [13]

Answer:

There are several other words:

Explanation:

lipid, sugar, protein, carbohydrate, etc. You can choose whichever one you want, it doesn't matter.

6 0
3 years ago
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