SELECTION AND SPECIATION

Question 1

Natural selection

Answer 1

Organims better adapted to their environment survive and reproduce in greater number so increase in allele frequency ocer a large period of time

Question 2

Hary-weing predictions

Answer 2

The allele frequency remain constant from 1 generation to another given that there is
1. No migration
2. No mutation
3. A large population
4.Mating/fertilisation is random
5. No selection

Question 3

What is a polygene

Answer 3

Continous variation
Characteristics controlled by more than one gene

Question 4

What is predominantly

Answer 4

Variation caused by genetic factor are discontinous
Catagoric data

Question 5

What is species

Answer 5

Group of individuals with similar charcteristics and same genes capable of interbreeding to produce fertile lffspring

Question 6

Who does environmental factor affect organisms

Answer 6

The way organisms gene are expressed

Question 7

What is genetic drift

Answer 7

Random increse or decrease in allele frequency

Question 8

What is gene flow

Answer 8

Change in allele frequency due to migration of fertile individuals

Question 9

Sympatric speciation

Answer 9

No geographicla isolation
Different gene pool

Question 10

Alopatric speciation

Answer 10

Geograohical isolation
Different gene pool

Question 11

Types of isolation

Answer 11

Temporal- breed at different time of the year
Ecological - different habitat within same area
Behaviorual - different courtship behavior
Mechanical - antaomical differences intervreeding is impossible for gametes to come together
Gametic- incompatibility between gametes prevents hybrid from formig
Hybrid- organisms interbreen but offspring are infertile