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Sholpan [36]
3 years ago
15

The table shows the results of the study testing the effectiveness of a migraine medication why was one group given a sugar tabl

et

Biology
2 answers:
77julia77 [94]3 years ago
8 0
A) to include a control group

nata0808 [166]3 years ago
5 0

Answer:

One group was given a sugar tablet as a placebo in order <em>to include a control group.</em> <u>The correct answer is A.</u>

Explanation:

In all these kinds of experiments with certain medicine in people's bodies, there is one group included that is given placebo -<em>not real medicine, in this case just sugar</em>- in order to let them feel they did actually took the real medicine and have them controlled. By doing this, they don't change their beliefs about the value of a treatment.

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A population of 100 tigers has 30 with horizontal stripes. Using pedigrees, you ascertain that horizontal striping is caused by
bixtya [17]

Assuming that this population is in Hardy-Weinberg equilibrium, we can sayt that  <em>the</em><em> probability</em><em> that, given enough time, all tigers in the population will have horizontal stripes is</em><em> 30% = 0.3.</em>

--------------------------

<u>Available data:</u>

  • Population size, N = 100 tigers
  • Number of Tigers with horizontal stripes = 30
  • Horizontal stripes is caused by an autosomal recessive mutation.

We need to know the probability that all tigers in the population will have horizontal stripes, which is the recessive phenotype.

We assume that the population is in Hardy-Weinberg equilibrium, so there should be no evolution.

Since the population is in H-W equilibrium, the allelic, genotypic and phenotypic frequencies will remain the same generation after generation.

Now, we will calculate the allelic and genotypic frequencies of horizontal striped individuals in the population.

There are 100 individuals, and only 30 have horizontal stripes.

So, the phenotypic frequency, F(HS) is 30/100 = 0.3 = 30%

Since this is a recessive phenotype, this value equals the genotypic frequency, F(hh) = 30%

Finally, we can get the allelic frequency by taking the square root of this value.

F(hh) = q² = 0.3

f(h) = q = √0.3 = 0.55 = 55%

According to these calcs, the probability for the fixation of the recessive allele is 55%, and the probability that all individuals express the recessive horizontal stripes phenotype is 30%.

--------------------------

You can learn more about Hardy-Weinberg equilibrium at

brainly.com/question/12724120?referrer=searchResults

brainly.com/question/9870841?referrer=searchResults

brainly.com/question/419732?referrer=searchResults

brainly.com/question/13603001?referrer=searchResults

brainly.com/question/5028378?referrer=searchResults

6 0
2 years ago
Which of the following is consumed by the photosynthesis reaction occurring in plants?
Rufina [12.5K]
C carbon dioxide i think
3 0
3 years ago
True vertebrates have a true head that develops from a neural crest of cells and hard structures surrounding the notochord.
Bond [772]

Yes. True vertebrates have a true head that develops from a neural crest of cells and hard structures surrounding the notochord.

The neural crest, which forms early in the development process in vertebrate embryos, is a fold on the neural plate where the neural and epidermal ectoderms converge. As an embryo grows, the neural crest produces neural crest cells (NCCs), which can differentiate into a variety of different cell types and contribute to tissues and organs.

The notochord is a temporary structure that plays a crucial role in higher animals. It secretes substances that communicate with all neighbouring tissues, telling them where they are and what will happen to them.

Therefore, True vertebrates have a true head that develops from a neural crest of cells and hard structures surrounding the notochord.

Learn more about notochord here:

brainly.com/question/11871768

#SPJ4

7 0
1 year ago
Helpppppp meeeee<br> please
Mekhanik [1.2K]
I believe the answer to this is B
7 0
3 years ago
A country was experiencing high birth rates because of widespread illiteracy. At the same time an epidemic broke out in this cou
Setler [38]

Answer:

B. urbanization

Explanation:

In urbanizing stage, death rate quickly declined because of the improvements in agricultural aspect which goes down to food supplies, health care delivery, medicine improvements, and even  the investments in sanitation and infrastructure which contributes to the increasing life expectancy of the people and lesser diseases which cause deaths.  Though birth rates remain almost the same, but young population continues to grow because of the low death rate.

5 0
3 years ago
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