Lecture 27

Question 1

examples of phenotypic characteristics

Answer 1

Question 2

At present, the growing use of genetic information, especially DNA sequence data, is increasingly allowing taxonomy to reflect___________ relationships.

Answer 2

phylogenetic (or evolutionary) relationships instead of characterization by phenotypic characterization

Question 3

genotypic forms of identification to identify phylogenetic (or evolutionary) relationships

Answer 3

You can use the DNA base composition to draw conclusions about relatedness: usually expressed as the percentage of GC (guanine plus cytosine) content.The base composition of a bacteria is theoretically a fixed property, thus comparing G+C content in different species can reveal a degree of species relatedness.

Question 4

Most precise method for classification. Allows scientist to draw phylogenetic relationships (evolutionary history) between organisms.

Answer 4

genotypic methods

Question 5

The best component of bacterial DNA that can be used in DNA sequencing to investigate phylogenetic relationships

Answer 5

Things missing from slide.

• It must be of sufficient length (must be able to align molecules to detect differences and similarities)
• It should be sufficiently conserved (meaning it is slow-changing)