The proportions of the bases are consistent within a species; however they do vary between species. Using the base-pair rules, complete the following table to show the percentage of each type of base in the five different organisms.

Answer:
The correct answer would be:
         A     G      C     T
Human: Â 31 Â Â Â Â Â 19 Â Â Â Â Â 19 Â Â Â 31
Cow: Â Â Â Â 28 Â Â Â Â 22 Â Â Â 22 Â Â Â Â 28
Salmon: Â Â 29 Â Â Â 21 Â Â Â 21 Â Â Â Â 29
Wheat     27    23     23     27
Yeast     31     19    19     31
Explanation:
According to the rule of Chargaff which states or explains the amount of the A, T, G, and C bases in the DNA molecule. It says that the DNA of any organism should have a pyrimidine and purine ratio of 1:1. This means the amount of A would be equal to T and the amount G should be equal to the amount of C.
It also says that the amount of a and G would be equal to the amount of C and T. So on the base of this we can find the missing value in the table:
          A     G      C     T
Human: Â 31 Â Â Â Â Â 19 Â Â Â Â Â 19 Â Â Â 31 Â (A= T and G=C)
Cow: Â Â Â Â 28 Â Â Â Â 22 Â Â Â 22 Â Â Â Â 28 Â (A= T and G=C)
Salmon: Â Â 29 Â Â Â 21 Â Â Â 21 Â Â Â Â 29 Â (A= T and G=C)
Wheat     27    23     23     27 (100 - A+T = G+C)
Yeast     31     19    19     31 (A= T and G=C)
The table will be:
          A        G          C           T
Human     31        19          19          31
Cow       28       22         22         28
Salmon     29       21         21         29
Wheat      27       23         23         27
Yeast       31        19         19          31   Â
Thus the above answer is right.
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