Evolution Systematics

Question 1

What are the two Origin of Life Hypotheses?

Answer 1

1. Subsurface hypothesis. 2. Surface Hypothesis

Question 2

What is the Subsurface Hypothesis?

Answer 2

Cells originated at Thermal Springs on Ocean Floor where conditions were less hostile than the Earth’s Surface.

Question 3

What is the Surface Hypothesis?

Answer 3

Cells arose out of a “primordial soup” that was exposed to gamma radiation, electric strikes and UV radiation. May have made building blocks of life, but environment too harsh to sustain life.

Question 4

How are Bacterial Species defined?

Answer 4

“a collection of isolated strains sharing a high degree of overall similarity in several independent traits, compared to other related groups of strains”

Question 5

Are Bacterial Species reproductively isolated?

Answer 5

No, genetic information can be exchanged between organisms of same species and of different species

Question 6

How much DNA is shared between organisms of the same “species”?

Answer 6

70% or Greater

Question 7

How much 16sRNA is shared between organisms of the same “species”?

Answer 7

97% or Greater

Question 8

Ernst Haekel Phylogenetic Tree

Answer 8

Morphological Characteristics

Question 9

Whittaker Phylogenetic Tree

Answer 9

Morphological and Physiological

Question 10

Carl Woese Tree

Answer 10

Similarity of 16sRNA sequences