Genetics Test 4

Select the best definition of a morphogen

A molecule like a signaling ligand that causes multiple distinct cellular responses that are dependent on its concentration.

Some mutations in the Lac Inhibitor (lacI) gene can cause its product to behave in a "dominant" manner, whereby the phenotype associated with a given lacI allele cannot be fully rescued by the addition of a normal lacI allele on an artificial chromosome. Which of the following is a feature of LacI that allows these mutations to function in a dominant fashion?

LacI functions as a tetramer.

Select the best definition of an operator.

A DNA sequence that is bound by a protein that modulates transcription of an operon.

Cytosine base methylation at a promoter typically [blank1] transcription of the corresponding gene. These methylation patterns are often [blank2] during mitosis.

silences or reduces, inherited/restored