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Amiraneli [1.4K]
3 years ago
6

Summarize the steps of sexual reproduction and explain how it increases genetic diversity

Biology
1 answer:
schepotkina [342]3 years ago
5 0
Sexual reproduction occurs through the stages of meiosis. Meiosis itself has two different rounds.

In the first round, the cell grows, copies its chromosomes, and readies itself for division (Interphase). Then, the chromosomes themselves condense and match up perfectly with a partner (specifically called a homologue partner) in Prophase I. These partners trade parts in what is called crossing over. This increases genetic diversity because it creates new combinations of chromosomes with unique alleles. After Prophase I, the chromosomes prepare for splitting (Metaphase I), and the homologues are then separated and moved to different sides of the cell (Anaphase I). Lastly, the chromosomes successfully arrive at the opposite ends, forming two daughter cells (Telophase I and Cytokinesis). This ends the first round of meiosis.

In the second round, the cell skips Interphase, but goes through the rest of the phases, resulting in 4 cells.
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How does the double-helical structure of DNA explain how the molecules can be copied or replicated?
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Answer:

A. Because of base pairing, each strand has all the information to serve as a template for the other strand.

Explanation:

Deoxyribonucleic acid (DNA) is a molecule composed of two antiparallel polynucleotide chains. This double helix serves as a template for its own duplication. DNA templating refers to the process by which a portion of the DNA molecule in a single strand is used as a template to be copied by complementarity base pairing. According to base-pairing rules, Adenine (A) always pairs with Thymine, while Guanine (G) always pairs with Cytosine (C). These nucleotide bases are each linked with their complementary base by hydrogen bonding. When base pairs separate, the hydrogen bond acceptor and donor groups of each strand allow the addition of nucleotides and synthesis of new DNA strands, a process catalyzed by specialized enzymes (DNA polymerases).

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3 years ago
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luda_lava [24]

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Calculate the population growth rates for the different population sizes shown below. Enter your values rounded to the nearest w
son4ous [18]

Population growth is a change in population at any time and can be calculated as a change in the number of individuals in a population using "per unit time" for measurement.

<h2>Further Explanation </h2>

The term population growth refers to all species, but always refers to humans, and is often used informally as a demographic designation of the value of population increase, and is used to refer to world population growth. Population growth itself is influenced by factors of birth, death, and migration. In demographics, there is a term increase in a natural population and an increase in the total population. Where natural population growth is only influenced by births and deaths, while total population growth is affected by births, deaths, in-migration, and out-migration (emigration).

Back to the population growth rate. The rate of population growth each year in a certain period is called the population growth rate expressed in percentage units (%). This population growth rate also reflects the rate of population growth of an area every year. The higher population growth rate indicates a faster rate of population growth. Conversely, if a low population growth rate shows a slow population growth rate.

When population growth can exceed the loading capacity of an area or environment, the results end with overpopulation. Disruptions in human populations can cause problems such as pollution and traffic congestion, even though they can be covered by technological and economic changes. This region can be considered "underpopulated" if the population is not large enough to manage the economic system.

Growth value = (end population period - initial period population) / initial population period

Growth ratio = Growth value X 100%

Learn more

population growth brainly.com/question/3412355

Details

Grade:  High School

Subject:  Biology

keywords: population, growth.

6 0
3 years ago
Climates are classified as tropical, temperate, or arctic based on their ?
Mamont248 [21]
They are based on their temperature and precipitation according to the <span>Köppen Climate Classification System</span>
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3 years ago
A client undergoing a skin test has been intradermally injected with a disease-specific antigen on the inner forearm. The client
yarga [219]

Answer:

Yes, there is a need to assure the client that this is a normal reaction.

Explanation:

In the given case, it is the duty of a nurse to assure the patient that swelling takes place while performing intradermal vaccination. As with the administration of disease-specific antigens, the injected area inflames that generally takes place due to the development of antibodies against the presented antigens.  

Thus, both the patient and the nurse need to be calm in such a situation and should leave the swelling open so that it can get heal by itself. In case, if one applies ice packs or rubs the affected area, it can enhance the condition and may result in more issues.  

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