Classification and Evolution

Question 1

How can 2 species still be classified as seperate

Answer 1

-Can still produce fertile offspring
-Genetically DIFFERENT

Question 2

What are Woese’s 3 Domains

Answer 2

Archaea
Eubacteria
Eukarya

Question 3

How can 2 species share similar traits but still not be related

Answer 3

CONVERGENT evolution -> INDEPENDENT evolution of similar species at different periods in time
CLASSIFICATION is based of Phlyogeny

Question 4

How can a molecule be used to compare 2 species

Answer 4

Sequence of A.A -> Smaller n. of differences means more cloesely related

Question 5

How can genetic diversity be maused

Answer 5

Genetic Polymorphism

Question 6

What is Genetic Drift and Genetic Bottleneck

Answer 6

DRIFT - One allele has high affect on whole pop. , more likely that alleles are lost from WHOLE POP.

BOTTLENECK - Many alleles are LOST -> Modern pop. descended from a few survivors

Question 7

What are 3 factors for speciation

Answer 7

Random Mutation
Time
Natural Selection

Question 8

How may a physical feature become more abundant in a population

Answer 8

SELECTION PRESSURE for prey avalability -> member of pop. gained a RANDOM MUTATION which have them a SURVIVAL ADVANTAGE -> more likely to survive and reproduce hence BENEFICIAL CHARACTERSITIC PASSED ONTO OFFSPRING
ALLELE frequency w/ relevant gene increase wit each gen.
REGULATORY GENE controls where pigments are produced

Question 9

How was DNA used to identify similarities between 2 species

Answer 9

Similar sequence means similar evolutionary relationship
Cytochrome C -> SAME protein implies evolutionary protein

Question 10

Why are some genes described as non coding

Answer 10

They are regulatory genes - not present in mRNA + not TRANSLATED