This question is not clear, but I think I understand what you are asking. The difference between alleles of a gene is that some alleles may be dominant or recessive. If one gene has more dominant alleles than another, than it will be more visible.
The correct answer is d: cDNA.
<span>cDNA or complementary DNA is DNA synthesized usually from messenger RNA (mRNA) by the enzyme reverse transcriptase. Because this molecule is from mRNA it contains only exons. cDNA is also produced naturally by retroviruses, for example, HIV virus.</span>
A Variety of instruments is needed to measure the change in the climate system because of B. The climate system involves several different factors that are measured differently
For example Wind and Temperature. Both of these factors will heavily affect the climate system but both these factors are so different and they need different instruments to be measured
