Answer:
Independent Variable: different types of cancer drugs
Dependent Variable: tumor size
Constants: gender of patient, (type of cancer/tumor perhaps)
Explanation:
The independent variable will always be what modifies the dependent variable to change. In this case, it is the different types of cancer drugs modifying the size of the tumor in the patients. Dependent variables are what get changed based off of what it is being modified by. The constants should be what stays the same throughout the experiment, or else it won't be a consistent one.
Answer:
In the case of these two parents, a quarter of their children would have blue eyes.
Explanation:
It is not only possible, it is expected that this would happen an appreciable fraction of the time. Brown eyes are dominant. Suppose eye color were dependent on a single Mendelian gene with two alleles, Br for Brown eyes and Bl for Blue eyes. (As Tracey Bryan has explained, this is not true -- I want to explain what the answer would be even in the simple case.) This means the three possible combinations of two alleles give the following eye colors:
BrBr => Brown
BrBl => Brown
BlBl => Blue
Now suppose two brown-eyed people have a child. We can't tell from the fact that they have brown eyes which pairs of alleles they have. Each of them could have either BrBr or BrBl. Suppose they each have BrBl. When they are crossed (i.e., they have a child), the child gets one allele from its mother -- it has a 50-50 chance of getting either one -- and one allele from its father -- again it has a 50-50 chance of getting either one. So, the child has:
25% chance of getting Br from mother and Br from father => brown eyes;
25% chance of getting Br from mother and Bl from father => brown eyes;
25% chance of getting Bl from mother and Br from father => brown eyes;
25% chance of getting Bl from mother and Bl from father => blue eyes.
So in the case of these two parents, a quarter of their children would have blue eyes.
<span>Identical twins may have the same DNA, hence their nature will be the same. However, the character of the different twins may vary because of variations in nurture. This is described as epigenetics which is the effect of environmental stimuli on genetic material without its change in sequence. This affects gene expression due to the differences in DNA methylation and histone modification profiles between the twins. </span>
Answer:
Solar energy warms gases that make up air