In a certain species of flower there are hairs (trichomes) normally present on the leafsurface. A mutation smooth is found in which the hairs are missing. Another mutationin the same species, called hairy, results in the presence of trichomes on the flowerpetals, where they are not normally formed. Cloning and sequencing indicate that thesemutations are different alleles of the same gene. Molecular analysis reveals that smoothis a frameshift mutation near the start of the coding sequence and that hairy has anupstream insertion of a transposable element that allows transcription of the gene inpetal tissue.
46) Based on your knowledge of Mendelian and molecular genetics, which of these
statements is the most likely to be correct about the smooth mutation?
a) it is a dominant, los-of-function mutation
b) it is a recessive, loss-of-function mutation
c) it will likely be codominant with hairy in transheterozygotes
d) it is a recessive, gain-of-function mutation
e) it is a dominant, gain-of-function mutation
47) A mutagen is
a) the process that repairs mutations
b) the experiment that generates mutants
c) the agent that creates mutations
d) the chemical reaction that generates mutations
e) the mutation that is generated by an agent