When a phenotype generated by particular alleles helps animals survive and reproduce more than their contemporaries, natural selection may boost the number of the advantageous alleles from a single generation to the next.
Natural selection alters phenotypic in what ways?The effect of natural selection upon single-gene traits can modify allele frequencies and, as a result, phenotypic frequencies. Natural selection on polygenic characteristics can have three effects on phenotypic distributions: directional selection, stabilisation selection, and disruptive selection.
How does the process of natural selection affect population growth over time?Natural selection is an evolutionary mechanism. Organisms that are better adapted to their surroundings are able to prosper and pass on the DNA that helped them thrive. Species change and split as a result of this process.
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3. Haz un gráfico con los datos de la tabla adjunta. Empieza en el año 0 y termina en 2007. Responde:
a. ¿A qué tipo de crecimiento corresponde, lineal o exponencial?
b. ¿Qué bucle de retroalimentación coincide con este crecimiento?
—Enumera algunos factores que hayan contribuido a este aumento progresivo de la población mundial.
The table referred to in the statement is a data table that establishes the number of inhabitants in different years since -300,000 years ago, where there were 500,000 inhabitants on the planet, until the year 2007, where there were 6.5 billion inhabitants.
To create a graph with two data streams,
Draw two perpendicular lines, one vertical and one horizontal, where the point where they intersect is 0.
On the vertical line, place all the amounts of inhabitants shown in the table, starting from the bottom up.
On the horizontal line, place the years starting at 0, which was the point of intersection of the lines.
Then, join the years with the number of inhabitants as shown in the graph attached in the image.
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--The complete question is, Make a graph with the data from the attached table. Start at year 0 and end in 2007. a. What type of growth does it correspond to, linear or exponential?
b. What feedback loop coincides with this growth?
List some factors that have contributed to this progressive increase in the world population.--
a scientist is examining a fern and wants to find the archegonia, so she looks for a location containing a
A scientist is examining a fern and wants to find the archegonia, so she looks for a location containing a megagametophyte.
The megagametophyte, also known as the embryo sac, is a female gametophyte that is found within the ovule of flowering plants. It is an essential part of the reproductive process and plays a critical role in the development of the plant embryo.
The megagametophyte is formed through a process of meiosis, which produces four haploid cells, three of which eventually degenerate. The remaining cell divides several times to form a multicellular structure that contains several nuclei but no cell walls, known as the embryo sac.
The number and arrangement of these nuclei varies among different plant species.
The megagametophyte is where the egg cell, which is necessary for sexual reproduction, is located. The egg cell is fertilized by a sperm cell that is delivered through the pollen tube, which grows from the male reproductive structure, the pollen grain.
The resulting fertilized egg then develops into the embryo, which eventually becomes the plant embryo.
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Note: complete question:
A scientist is examining a fern and wants to find the archegonia, so she looks for a location containing a
megaphyll.
microgametophyte.
microspore.
stomate.
megagametophyte.
megagametophyte
Desert plants are characterized by
A. Broad leaves
B. Succulent stems
C. Deciduous leaves
Desert plants are characterized by Succulent stems .
The correct option is B .
Broad leaves are generally not common in desert plants because they lose water through transpiration, which is the process of water loss from plant leaves. Therefore, desert plants have evolved to have small or narrow leaves to minimize water loss. Succulent plants are a good example of this adaptation. Succulents are characterized by their thick, fleshy stems and leaves, which are able to store large amounts of water for long periods of time.
Also, many desert plants have evolved to retain their leaves year-round, instead of shedding them seasonally like many other types of plants. This adaptation helps to conserve water, as shedding leaves is another way of losing water.
Hence , B is the correct option
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herpes simplex virus can only be spread by symptomatic patients. group of answer choices true false
The statement "herpes simplex virus can only be spread by symptomatic patients" is false.
Herpes simplex virus can be spread by both symptomatic and asymptomatic patients. Asymptomatic patients may not show visible symptoms, but they can still transmit the virus to others through viral shedding.
HSV is a highly contagious virus that can be transmitted through direct contact with infected body fluids, such as saliva, genital secretions, or lesions caused by the virus.
The virus can be passed even during times when there are no visible symptoms, which is why it is essential to practice safe sex and take appropriate precautions to prevent the spread of the virus.
It is also important to note that there are two types of herpes simplex virus: HSV-1 and HSV-2. While HSV-1 is typically associated with oral herpes (cold sores) and HSV-2 is associated with genital herpes, both types can infect either location.
Additionally, HSV-1 can be spread to the genitals through oral sex, and HSV-2 can be spread to the mouth through genital-to-oral contact.
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hair on mammals can be used for all but which of the following? group of answer choices camouflage defense sensory functions insulation all of the above
The correct answer is "e) all of the above". Hair on mammals can be used for camouflage, defense, sensory functions, and insulation.
What four purposes do mammals' hair serve?Hair is used by modern mammals to protect, signal, hide, insulate, and detect their immediate environment. Insulation protects against excessive heat as well as serves to conserve heat, as it does for nocturnal desert animals like the camel.
What purposes do animals' hair serve?Many goods use animal hair. Brushes and stringed instrument bows both use horse hair. Hog bristle, ox hair, and Siberian weasel hair are all used.
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what property of oric in e. coli allows the double-stranded dna to be more easily separated than the rest of the genome?
The property of ORI (Origin of Replication) in E. coli that allows the double-stranded DNA to be more easily separated than the rest of the genome is its AT-richness.
The DNA sequence known as ORI serves as the starting point for DNA replication. In comparison to other parts of the genome, the ORI sequence in E. coli is relatively AT-rich, meaning it has a higher percentage of adenine and thymine nucleotides.
Because of this AT-richness, DNA strands can unwind more readily, which makes them more vulnerable to enzymes that split the strands.
Because the DNA strands are simpler to separate and the replication machinery can access the template strands more quickly because to this characteristic, replication can proceed more swiftly.
Additionally, because the ORI sequence is only present in one place in the genome, its AT-richness contributes to ensuring that replication starts at the appropriate place.
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a record of the potential differences generated by the heart and conducted via body fluids to the surface, where it is detected by electrodes, is called a(n) recording.
The record of the potential differences generated by the heart and conducted via body fluids to the surface, where it is detected by electrodes, is called an: electrocardiogram (ECG) recording.
An electrocardiogram is a recording of the electrical activity of the heart. Electrodes are placed on the skin to detect the electrical impulses generated by the heart and transmit them to a machine, which records the data as a graph.
The ECG is a useful tool for diagnosing various heart conditions, such as arrhythmias, conduction abnormalities, and ischemia, and is often performed as a part of routine medical checkups, during cardiac procedures, or in emergency situations.
The recorded data can provide valuable information about the heart's structure and function, helping healthcare providers to identify and manage heart-related issues.
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a difference between a g and an a at a particular nucleotide is an example of a(n) snp. str. microarray. dna transposon. microsatellite.
An illustration of snp is a difference between a g and an a at a specific nucleotide. The correct answer is SNP.
The substitution of a C for a G in the nucleotide sequence AACGAT, which results in the sequence AACCAT, is an illustration of an SNP. The DNA of people might contain numerous SNPs since these varieties happen at a pace of one in each 100-300 nucleotides in the human genome.
A single nucleotide change in a genome is known as an SNP. Likewise, it is a sort of change. Base pair substitution, insertion, deletion, duplication, or variation in DNA is known as a mutation.
The primary distinction between an SNP and a mutation is that a mutation is any change in DNA, from a single to many nucleotide difference, whereas an SNP is a single nucleotide difference in DNA.
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Ch 15
The nurse is admitting the patient to the nursing unit at the hospital. the nurse is concerned that the patient is at risk of deep vein thrombosis because of which of the following risk factors? Select all that apply.
A. Pt's advanced age
B. Pt's admitting diagnosis of cancer
C. Pt's stated drug allergy to aspirin
D. Pt's history of of prior venous thrombosis
E. Pt's low protein diet
The following risk factors for deep vein thrombosis (DVT) are:
A. Pt's advanced age
B. Pt's admitting diagnosis of cancer
D. Pt's history of prior venous thrombosis
Advanced age is a risk factor for DVT because the risk of developing blood clots increases as we age. Admitting diagnosis of cancer also increases the risk of DVT, as cancer cells can release substances that increase the risk of blood clots. A history of prior venous thrombosis is also a significant risk factor for developing DVT again.
Option C, Pt's stated drug allergy to aspirin, is not a risk factor for DVT. In fact, aspirin is often used as a preventative measure for DVT in some patients.
Option E, Pt's low protein diet, is not a significant risk factor for DVT.
Therefore, the correct options are A, B, and D.
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