Exam 16: Mechanisms of Genetic Variation

Which of the following effects may be mediated by transposable elements?

The incorporation of a single strand of donor DNA into a recipient DNA duplex so that the donor strand replaces one of the strands or the recipient duplex generates __________ DNA.

The Ames test

Lethal mutations can be recovered in haploid organisms if they are

Which of the following is a possible fate for an exogenote?

In an F⁺ $\times$ F^- mating,all or part of the host chromosome usually is transferred to the recipient.

__________ mutations affect only a single base pair in a gene.

A __________ mutation is one that causes premature termination of the synthesis of the protein product.

Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?

Which of these transposable elements do not carry genes for functions other than those needed for transposition?

Microbial strains that can grow on minimal medium are called __________.

Complete transfer in an Hfr $\times$ F^- mating takes approximately __________ minutes.

When a recipient cell acquires a piece of naked DNA from the environment,it is called

A __________ mutation does not alter the amino acid sequence of the resulting protein.

__________ mutations occur in the promoter or operator region of a gene or set of genes and affects the expression of the downstream genes without affecting the amino acid sequences of the gene products.

Transfer of genetic information via direct cell-cell contact is called

Transposons that transpose by inserting a copy at a new location while a copy remains at the original location are said to transpose by _______________ transposition.

Repair of thymine dimers using light to split the dimers apart into separate monomers is called

A __________ is a piece of extrachromosomal DNA that has its own replication origin.

Transfer of genes from one mature independent organism to another is called