B)Among all the plants that germinate, what proportion will be heterozygous?
C)What proportion will be homozygous dominant?
Answer: In a population with a single dominant allele responsible for PCB resistance, if 45% of seeds from a randomly mating population of resistant weeds germinate in contaminated soil, the frequency of the resistance allele (R) is approximately 0.6 or 60%.
Explanation: To calculate the frequency of the resistance allele, we can use the square root rule. Since resistance is due to a dominant allele, the proportion of the resistant homozygotes (RR) and heterozygotes (Rr) in the population equals the frequency of the resistance allele (R).
Let p represent the frequency of the resistance allele (R). The proportion of homozygous resistant individuals (RR) would be, p * p = p^2.
The proportion of heterozygous individuals (Rr) would be 2 * p * (1 - p).
Given that 45% of seeds germinate in contaminated soil (Rr + RR = 0.45), We can solve for,p:
- p^2 + 2 * p * (1 - p)
= 0.45.
Solving the quadratic equation,
we get p ≈ 0.6.
Therefore, the frequency of the resistance allele (R) is about 60%.
To find the proportions of heterozygous and homozygous dominant individuals, we can substitute the value of p back into the formulas.
The proportion of heterozygotes (Rr) is ,
2 * 0.6 * (1 - 0.6) = 0.48, and
the proportion of homozygous dominants (RR) is ,
0.6^2 = 0.36.
In conclusion, when 45% of seeds from a population of resistant weeds germinate in contaminated soil, the frequency of the PCB-resistance allele (R) is about 60%. Among all germinating plants, approximately 48% will be heterozygous (Rr), and about 36% will be homozygous dominant (RR).
To know more about Resistance Allele;
The frequency of the PCB-resistance allele is approximately 0.67. Approximately 44% of the plants that germinate will be heterozygous, and approximately 45% of the plants that germinate will be homozygous dominant.
To calculate the frequency of the PCB-resistance allele, we can use the Hardy-Weinberg equation. Let's assume that the frequency of the PCB-resistance allele is represented by 'p'.
According to the question, 45% of the seeds from a randomly mating population of resistant weeds will germinate in contaminated soil. This means that the germination rate of the resistant seeds is 0.45.
Since the resistance to PCBs is controlled by a single dominant allele, the frequency of the resistant genotype (RR) can be calculated using the equation p^2, where p is the frequency of the PCB-resistance allele.
Therefore, p^2 = 0.45.
Taking the square root of both sides, we get p = √0.45 ≈ 0.67.
So, the frequency of the PCB-resistance allele is approximately 0.67.
To calculate the proportion of heterozygous individuals, we can use the equation 2pq, where p is the frequency of the PCB-resistance allele and q is the frequency of the recessive allele.
Since there is only one dominant allele (PCB-resistance allele), the recessive allele frequency (q) can be calculated as 1 - p.
Therefore, q = 1 - 0.67 = 0.33.
Using the equation 2pq, we can calculate the proportion of heterozygous individuals as 2 * 0.67 * 0.33 = 0.44.
So, approximately 44% of the plants that germinate will be heterozygous.
To calculate the proportion of homozygous dominant individuals, we can use the equation p^2, where p is the frequency of the PCB-resistance allele.
Using the frequency of the PCB-resistance allele (p = 0.67), we can calculate the proportion of homozygous dominant individuals as 0.67^2 = 0.45.
So, approximately 45% of the plants that germinate will be homozygous dominant.
Explore PCB-resistance allele frequency and dominant plant proportions in resistant weed populations. Learn more here.
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Of the statements shown above the best one that describes a situation that would reduce the stability of a forest ecosystem is answer choice…
A) A fierce predator is removed from the ecosystem.
The reason is that as we already know ecosystems are very complex and diverse, with levels and relationships between organisms that keep the stability of it. Removing any level from an ecosystem may disrupt the balance that may have been established over many years.
I hope it helps, Regards.
B. consumption of fruits and vegetables that produce a biofuel.
C. consumption and radiation of energy in the atmosphere.
D. absorption and radiation of energy in the atmosphere
Answer:
The correct answer would be D. absorption and radiation of energy in the atmosphere.
Green house effect refers to the process by which heat or radiation from the sun as well as those radiated from the surface of the earth are trapped in the atmosphere.
It gradually results in increase of the temperature of the earth.
Due to increase in greenhouse gases such as carbon dioxide, methane et cetera the average temperature of the earth keeps on increasing and thus results in global warming.
The warming up of Earth's atmosphere due to absorption and radiation of energy is called the greenhouse effect.
Further Explanation:
The process that causes the atmosphere of the Earth to trap the heat released by the Sun is called the greenhouse effect. During this process, the Earth becomes warmer as compared to the absence of the atmosphere. It is a natural process in which some of the Sun's energy that reaches the atmosphere is reflected. In contrast, the rest of the energy is reabsorbed and irradiated by the greenhouse gases. The various greenhouse gases are methane, carbon dioxide, water vapor, and nitrous oxide. This absorbed energy causes heating up of the atmosphere and the Earth's surface. Life on Earth is possible due to this effect as it maintains the temperature at 33 degrees Celsius warmer.
Certain human activities are responsible for enhances the greenhouse gas concentration, such as clearing of agricultural land and the burning of fossil fuel. This increased greenhouse effect leads to further warming up of the Earth. The steps involved in the greenhouse effect and its enhanced effect are as follows:
The excess absorption of carbon dioxide by the ocean makes the water more acidic, which is not good for aquatic life and is called ocean acidification.
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Answer Details:
Grade: High School
Chapter: Greenhouse Effect
Subject: Biology
Keywords:
Greenhouse effect, greenhouse gases, atmosphere, Earth's surface, carbon dioxide, nitrous oxide, methane, water vapor, solar radiation, clearing of land, burning of fossil fuels, ocean acidification.
mitochondria produce water from oxygen while chloroplasts produce oxygen from water. I just did it and got it wrong because of the answer below. So mad.