Answer:
The correct answer is:
Includes at least two groups, one of which does not receive the experimental treatment. (B)
Explanation:
A controlled experiment is made up of at least two groups of participants (subjects). One group (the test group) receives the experimental treatment, which can be an intervention or a new drug to be tested etc, and the effect of the treatment on the subjects is measured, while the second group of similar subjects also known as the control group acts as a baseline and do not receive the treatment or intervention. They act as a baseline to ensure that the change observed in the treatment group was brought about as a result of the treatment.
<em>Note that repeating the experiment several times does not ensure accuracy of the result, rather it ensures reliability of the results hence option D is not correct</em>
Answer:
5 · every skin cell in a human body
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Answer:
The frequency of the recessive allele which codes for grey pelt character will rise above 20%, while the that of the dominant allele that confers brown pelt character will decrease below 80%.
Explanation:
Since the population of foxes with brown pelts are being selectively hunted by humans, the population of foxes with brown pelts will keep reducing while the population of foxes with grey pelt will thrive in its place.
<em>Hence, the the frequency of the recessive allele which confers grey pelt attribute will rise above original 20% within the population, while the dominant allele will decrease below 80%.</em>
