Bio (regular) evolution

Question 1

example of sexual selection

Answer 1

Trinidadian guppies, upstream there is only one predator, so they are very colour full (sexual selection outweighs natural selection), downstream males have multiple predators so they’re less colourful (natural selection outweighs sexual selection).

Question 2

High Risk:

Life history:

• Age at maturity Life span

Foraging behaviours:

• Feeding rate in predator presence

Social behaviours:

• Courtship intensity
• Schooling tendency

Answer 2

.
.
.

Younger, Short

.
.
High

.
.
High
strong

Question 3

Low Risk:

Life history:

• Age at maturity Life span

Foraging behaviours:

• Feeding rate in predator presence

Social behaviours:

• Courtship intensity
• Schooling tendency

Answer 3

.
.
.
.
Older, Young

.
.
Low

.
.
Low
Weak

Question 4

3 things required for evolution

Answer 4

variation among individuals
traits are heritable
only the fittest survive

Question 5

important thing to note about artificial selection

Answer 5

while you selection one particular trait, you inadvertently affect multiple other traits as traits are controlled by multiple genes.

Question 6

captive breeding programs

Answer 6

relaxed selection pressures
change in the direction of selection
new selective pressures