A cell containing a single chromosome is placed in a medium containing radioactive phosphate, making any new DNA strands formed by DNA replication radioactive. The cell replicates its DNA and divides. Then the daughter cells (still in the radioactive medium) replicate their DNA and divide, resulting in a total of four cells. Sketch the DNA molecules in all four cells, showing a normal (nonradioactive) DNA strand as a solid line and a radioactive DNA strand as a dashed line.

Answer is explained below.

Explanation:

The DNA (deooyrtonucleic acid) molecule undergoes replication in conservative manner

The two strands separate, a new strand is synthesized by the incorporation of nucleotides   followed by ligation.

Thus, in the daughter double helix,  one of the strand is newly synthesized So. whet replication  occurs in vitro ,  with the help of radioactive phosphate, me newly synthesized strand can be traced  .A detailed diagram of the DNA replication in a medium contain radioactive phosphate is shown  in attached image.

The blue dotted ones are the sequence of nucleotides incorporated. The parent template with

non-radioactive phosphate (solid line) is copied in the daughter cells. This is consistent with the

Messelsion and Stahl experiments. In the next cycle, the hybrid strands separate and act as

template, in which a hybrid strands and a non-hybrid strands with radiophosphates on either

strands is formed.

With the cycles of replication, the strand with radioactive isotopes increase compared to the

mother strand with non-radioactive phosphates.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

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