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Ede4ka [16]
3 years ago
14

What are the 4 steps to purify DNA from a cheek swab.

Biology
1 answer:
julsineya [31]3 years ago
6 0
<span> 1.) Collect cheek cells. 2.) Burst cells open to release </span>DNA<span>. 3.) Separate </span>DNA<span> from proteins. and debris. </span>4<span>.) Isolate concentrated .</span>
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In a particular population of mice, certain individuals display a phenotype called "short tail," which is inherited as a dominan
WARRIOR [948]

Answer:

The "short tail" dominant allele is easier to eliminate by selective breeding.

Explanation:

The only way for a recessive allele to be expressed (be visible) is when it appears as recessive homozygotic. These means the organisms need to have 2 copies of the gene. Selective breeding is based on the characteristics that one can see, so if the organism shows the "dilute" phenotype you can keep reproducing this individuals and get rid of the dominant allele.

On the other hand if you have a population with the dominant phenotype, you discard all the ones that have a recessive trait and you breed the dominant phenotype you could still get individuals with the recessive phenotype and individuals that express the dominant phenotype but are heterozygous.

5 0
3 years ago
The observation that members of a population are uniformly distributed suggests that A. resources are distributed unevenly. B. t
ANEK [815]

The observation that members of a population are uniformly distributed suggests that   the members of the population are competing for access to a resource.

Option B is correct.

What is a resource ?

A resource is any physical material constituting a part of Earth that people need and value. Natural materials become resources when humans value them. The uses and values of resources change from culture to culture and from time to time. Resources are spatially distributed varying in quantity and quality.

Why the resources are important?

Resources are necessary for citizenry because of the following reasons: Resources when used as a raw material satisfy the needs and comforts of human beings. Natural resources are a source of agricultural activities which adds to the economic importance. They also provide employment opportunities.

Learn more about resource :

brainly.com/question/24514288

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5 0
1 year ago
Study the map. Which plate forms a boundary with the African Plate?
Yuki888 [10]

Answer:

down below

Explanation:

The western edge of the African Plate is a divergent boundary with the North American Plate to the north and the South American Plate to the south which forms the central and southern part of the Mid-Atlantic Ridge.

7 0
3 years ago
Read 2 more answers
A. How do the Earth’s physical factors influence population density? When population growth increases in an area, what is happen
madreJ [45]

Question 1 The world's population is spread very unevenly. Some spaces are empty or very sparsely populated: we speak of human deserts:

• Cold polar environments are the least populated regions: the ground, frozen permanently, prevents any form of agriculture, the very low temperatures make the habitat difficult.

• The hot or cold desert environments are also not busy: the lack of rain and the strong heat during the day limit the activities of men. The only exceptions are oases.

• The role of relief is more difficult to define. High temperate mountains like the Alps are generally sparsely populated but tropical chains like the Andes have a high population density. However, men have generally settled in the plains, in the valleys (along with the rivers) and on the coasts.

There are also other factors unrelated to land factors that influence population density such as job availability, or even historical factors.

Question 2: Birth rate:

The birth rate (sometimes called the crude birth rate) is the ratio of the annual number of births to the average total population for that year. When the population grows, the contact between people will be more permanent, and it will increase the marriage rate, and thus the birth rate. Age structure:The age structure is a mode of graphical representation of the structure (of age as well as of sex) of a population which constitutes a synthetic image of the past, present and future of the population.When a population resides for a long time in the same place (in favorable conditions, not raising the death rate and without moving), this will vary the age structure by observing an increase in the elderly population.

8 0
3 years ago
Read 2 more answers
Group 1
Yuliya22 [10]
In earth science, erosion<span> is the action of surface processes (such as water flow or wind) that remove soil, rock, or dissolved material from one location on the Earth's crust, then transport it away to another location. so the area would experience the most erosion is the area with </span><span>a severe thunderstorm & a dry area with little vegetation because thunderstorm will give so much rain flow and wind since there are little vegetaion, no one will hold the soil together and lessen the impact of water flow</span>
5 0
3 years ago
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