Question

Complete each sentence about the effects that mutations can have on DNA structure and expression.

In general, the more prevalent form of a gene and its associated phenotype is
called the  ____________ .

A mutation from wild type to a mutant form is a  ____________  mutation.

The effect of a forward mutation
can be reversed by a second mutation that restores the wild-type  ____________ .

When the second mutation is
at the same site as the original mutation (e.g., the same base pair in a codon), it is called a  ____________ mutation.

If the wild-type phenotype is restored by a
second mutation at a different site than the original mutation, it is called a  ____________  mutation.

Choices

Forward, Phenotype, Reversion, Wild Type, Suppressor

An effective selection technique uses incubation conditions under which the  ____________  grows because of properties conferred by the mutation, whereas the wild type does not.

In order to isolate revertants from a lysine  ____________ , a large population of lysine auxotrophs is plated on minimal medium lacking lysine, incubated, and examined for colony formation.

Only cells that have mutated to restore the ability to synthesize lysine will grow on  ____________ .

Several million cells can be plated on a single Petri dish, but only the rare  ____________  cells will grow.

Thus many cells can be tested for  ____________  by scanning a few Petri dishes for growth.

Choices

Minimal medium, revertant, auxotroph, mutant, mutations

Answer 1

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