Answer:
They used radioactive labeling techniques to build two different types of phage.
Explanation:
In 1952, a set of experiments were carried out by American biochemists Alfred D. Hershey (1908-1997) and Martha Chase. They prepared two separate virus samples, one contained DNA labeled with a radioactive isotope and the other contained protein labeled with a different radioactive isotope. They grew the two types of viruses separately, infected bacteria with the two sets of phages and analyzed the bacteria for radioactivity. From the results obtained, Hershey and Chase concluded that the viral genetic material was DNA and not protein, reinforcing the observations previously made by Avery.
I think the answer is c may not be fully right
<u>Answer</u>:
According to the principal of dominance, if a recessive gene for tallness is paired with another recessive gene for tallness, the organism will be tall.
<u>Explanation</u>:
According to the law of dominance, parent having contrasting characteristic and is a true breeder, will be allowed to breed. The trait is dominant, which will be seen in the next generation. Dominant trait masks the expression of the recessive trait. Recessive trait will only appear only when the genotype will be 'homozygous recessive'. In this case recessive gene for tallness will be paired with another recessive gene, this will result in homozygous recessive genotype.
Both euchromatin and histone acetylation.