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Question: Taylor conducted the experiments to the semiconservative model of chromosome replication on A. _D...

Taylor conducted the experiments to the semiconservative model of chromosome replication on
A. Drosophila melanogaster
B. E. coli
C. Vinca rosea
D. Vicia faba

Explanation

Solution

With the advancement of molecular genetics study and with the discovery of Structure of DNA by Watson and Crick in the year 1953 it led to further development of DNA structure and how the replication occurs in a DNA molecule. Further studies were continued to know the nature of a replication.

Complete answer: With the study of Watson and Crick although the structure of DNA was known and it seemed that the base pairing occurs in the molecule of DNA but the question now arises how this structure of DNA replicates.
Further, with the study of Taylor and his colleagues in the year 1958, the semiconservative mode of replication was seen. They performed their experiments on Vicia faba.
Taylor conducted his experiment on treated root tip cells of Vicia faba and treated it with radioactive thymidine (3H) to label the molecule of DNA and then they grew it in the normal unlabelled medium having colchicine to see the semi-conservative nature of the chromosome replication. Semi conservative mode of replication produces two copies of DNA each copy containing one original strand and one new strand of DNA.
It was seen that in the first generation that radioactivity uniformly distributes in both the strands and therefore in these cases the original strand of DNA having a 3H label was seen along with another non labeled strand of DNA.
Also in the second division, only one strand is shown radioactivity, and another strand is non-labeled.
This proved the semi-conservative nature of the DNA.

So, the correct answer to this question is the option"D".

Note: With the study of Taylor further studies were possible to conduct to achieve more success in the molecular genetics and nature of DNA was completely understood and its replication was understood completely. Semi conservative nature of DNA is the reason why the characters of parents are inherited in their progeny.