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Kruka [31]
3 years ago
6

Trey is conducting an experiment to determine which fish food causes the most goldfish activity over a period of two weeks. He i

s going to set up ten fish tanks with 4 goldfish each. He will feed the fish in half of the tanks Swift Salmon food and the fish in the other half of the tanks Fast Flounder food. He will expose them to direct sunlight for 4 hours per day. Each tank will have the same size and type of goldfish, which will be fed the same amount of fish food. Each tank will be filled with the same type and amount of water and with the same type and amount of river rock.
Which change would be the most effective way to improve the validity of this experiment?
A) Increase the number of goldfish in each tank.
B) Increase the daily amount of food for each tank.
C) Create another group that is fed regular fish food.
D) Increase the number of tanks in each treatment group.
Biology
1 answer:
statuscvo [17]3 years ago
6 0

Answer: C)

Explanation: You need a control group.

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Distinguish between directional, stabilizing, and disruptive selection. Give examples.
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Directional selection is a type of natural selection that favors one extreme phenotype over the mean or another extreme. Examples of directional selection include giraffes that have long necks and the darkening of London's peppered moths after the Industrial Revolution.

Stabilizing selection, also known as purifying selection, is a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value. An example of stabilizing selection is birth weigh in humans.

Disruptive selection is a type of natural selection that shows a preference toward the reproduction of genetic material at the extremes within a population.One of the most studied examples of disruptive selection is the case of ​London's peppered moths.
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3 years ago
Kim wants to grow some more plants in her garden. She has to plan carefully because she has an allergy to plant pollen. Which pl
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3 years ago
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16. Why should the recessive phenotype be used first to determine the q squared value instead of the dominant phenotype to deter
podryga [215]

The recessive phenotype is used first to determine the q squared value because it is only expressed when h0m0zygous.

<h3>What is a recessive phenotype?</h3>

A recessive phenotype is a phenotype which expresses the recessive trait of a gene.

The recessive phenotype is always h0m0zygous for that triat to be expressed.

In the Hardy-Weinberg equilibrium equation, the allele and phenotype frequencies are given as follows:

  • p^2 + 2pq + q^2 = 1

where;

  • p^2 is the h0m0zygous dominant phenotype frequency
  • 2pq is the heterozygous phenotype frequency
  • q^2 is the h0m0zygous recessive phenotype frequency

Therefore, the recessive phenotype is used first to determine the q squared value because it is only expressed when h0m0zygous.

Learn more about recessive phenotype at: brainly.com/question/22117

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Describe the three main properties of a population​
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Population refers to an array of organisms of the similar species, which thrives in a particular geographical region and interbreed. The three main characteristics of a population are density, size, and dispersion.  

The density signifies towards how many organisms are thriving in a specific region. The size refers to how big a population is, and dispersion signifies towards the degree of spreading of the particular population.  

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2 years ago
What is carrying capacity?
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Answer:

Carrying capacity is the <u><em>maximum number of individuals an area can support without degrading the environment</em></u>.

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