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ValentinkaMS [17]
4 years ago
15

A scientist who is researching marshes observes that marsh grass, Spartina bakeri, grows to different heights at different locat

ions in the marsh. If the scientist wants to find the reason for this difference, what is the correct first step? Conduct an experiment and change only one variable at a time. Determine which technology would assist most in answering the question. Form a research question based on knowledge of the marsh. Establish a control group for comparison.
Biology
2 answers:
9966 [12]4 years ago
7 0
I belive "form a research question based on knowledge of the marsh," in other words, your hypothesis which is the 1st step in the scientific method after observation (which your scientist has already done)
MAXImum [283]4 years ago
7 0

The correct first step would be to conduct an experiment and change only one variable at a time.

There are generally two types of variables in all the valid research, that is, independent and dependent variables. These variables permit a researcher to find the precise association among the variables.  

Thus, in the given study, if the scientists are aiming to determine the cause of length distinction in the marsh grass, then he has to perform an experiment with the application of independent and dependent variables.  


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The two genes f and g, code for body size and aggressiveness, respectively. The F allele is dominant over f, and codes for a lar
mrs_skeptik [129]

Answer:

The correct answer is option C.

Explanation:

As it is given that, a Mendelian cross is performed between two parents resulted by cross the parents. This suggests that the parents or P generation has zero recombination hence the genotype of Parents would be AA and aa in nature. Therefore, all the F1 generation offspring were Aa in nature. The selfing of the F1 offspring will be:

         A  a

A AA Aa

a Aa aa

Genotype: AA: Aa: aa :: 1:2:1

Phenotype: Dominant: recessive :: 3:1

4 0
3 years ago
Which of the following correctly defines sustainability?
igor_vitrenko [27]

Answer:

Promotes and maintains under which nature and humans can co-exist indefinitely

Explanation:

The ability to sustain something is known as <u>sustainability</u>.

ecology defines it as a means of configuring civilization and human activity so that society, its members and its economies are able to meet their needs and express their greatest potential in the present, while preserving biodiversity and natural ecosystems, planning and acting for the ability to maintain these necessary resources for future generations.

3 0
1 year ago
small group of 100 people decide to isolate themselves from the world and move to a small and remote deserted island. Out of thi
irina [24]

Answer:

Frequency of p = 0.684

Frequency of p = 0.316

Number of individuals with homozygous dominant (AA) = 47

Number of individuals with heterozygous (Aa)= 43

Number of individuals with homozygous recessive (aa) = 10

Explanation:

Out of 100 people, 10 have albino skin (aa)

So, the frequency of homozygous recessive individuals (q^{2}) is \frac{10}{100} = 0.1

Now, q will be

= \sqrt{q^{2} } = \sqrt{0.1} \\= 0.316

As per Hardy Weinberg's equation -

p + q = 1

Substituting the value of q in above equation, we get -

p + 0.316 = 1p = 1 -0.316\\p = 0.684

Now the frequency of homozygous dominant (AA) will be

p^{2} = 0.684^{2} \\= 0.467

Hence, out of 100 people 0.467 * 100 = 46.7 or 47 people are homozygous dominant (AA)

Like wise out of 100 people 0.1 * 100 = 10 people are homozygous recessive (aa)

As per As per Hardy Weinberg's equation-

p^{2} + q^{2} + 2pq = 1\\

Substituting the values in above equation, we get -

0.467 + 0.316 + 2pq = 1\\2pq = 1 -( 0.467+ 0.1)\\2pq = 0.433

So, out of 100 people 0.433 * 100 = 43.3 or 43 people are heterozygous (Aa)

7 0
4 years ago
3 differences between mitosis and meiosis
lubasha [3.4K]
Mitosis is a standard part of the cell cycle, the process that ensures DNA gets duplicated and shared to two daughter cells when a cell replicates. meiosis only occurs when a gamete, sex cell is made
3 0
3 years ago
Which of the following statements is correct?
nekit [7.7K]

Answer:

<h2> "Archaea are older organisms than eukaryotes" </h2>

<h2>Explanation:</h2>

Archean are group of organisms classified under the domain Archae bacteria. They are found in environments with extreme conditions e.g.

high temperature etc.

They are prokaryotic in nature i.e. they do not possess a membrane-bound nucleus in their cells.

Based on this, archaea are not classified under the same domain as bacteria (domain- protista). They are unicellular organism, archaea are older set of organisms than eukaryotes.

3 0
3 years ago
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