Question

Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

• A. E. coli
• B. Vinca rosea
• C. Vicia faba
• D. Drosophila melanogaster

Answer 1

The correct option is C Vicia faba

Taylor (1969) conducted his experiments with root tip cells of Vicia faba (broad bean). He treated root tips with radioactive thymidine to label the DNA. Then root tips were grown in the normal medium. In the first generation, both chromatids were labeled.

In the second generation of cell division, one chromatid of each chromosome was labeled and one was normal. This demonstrated semi- conservative mode of chromosome replication.