Lecture 25

Question 1

human activity not shared by other species

Answer 1

cooking our own food

Question 2

characteristics of homo sapiens

Answer 2

• big brain
• small mouth and face
• protruding chin
• long limbs
• short trunk

Question 3

Genetic Code is Redundant

Answer 3

multiple codons code for the same amino acid

Question 4

Genetic Drift acts on…

Answer 4

silent site or non-synonymous substitution

Question 5

Selection acts on

Answer 5

non-synonymous substitutions

Question 6

Directional Selection favours

Answer 6

base changes that have a positive effect on protein function

-high ratio of non-synonymous to synonymous

Question 7

HAR1

Answer 7

codes for an RNA molecule that folds into a stable structure

Question 8

Where HAR1 is expressed

Answer 8

only in the brain, rapid changes in human HAR1 are likely related to the fast evolution of the human brain