C2:Variation and evolution not insihed

Question 1

Explan the difference between continous and discountinous variation

Answer 1

Continuous variation:
Characteristics have many possible values.
Generally polygenic (being controlled by many genes).
Gene expression is influenced by the environment.
Forms a normal distribution curve. Bell curve

Discontinuous variation:
Characteristics are discrete and have no intermediates.
Monogenic (controlled by a single gene).
Gene expression not influenced by the environment.

Question 2

Conditions for the hardy weinberg equation

Answer 2

No immigration or immigration
No mutations
Random mating
Large population
Equal allele frequency in females and males
Organisms are diploid

Question 3

three types of selection

Answer 3

Disruptive

Stabilising

Directionsal

Question 4

three conditions when speciation can occur

Answer 4

genetic drift in isolated population

the founder effect of disproportionate allele frequencies in small populations

natural selection

Question 5

name two types of speciation

Answer 5

Allopatrick - geographically in different locations

Sympatric - geographically in the same locations

Question 6

name two types of reproductoive isolation

Answer 6

pre zygotic
post zygotic

Question 7

name four types of pre zygotic isolation

Answer 7

geographoiccly
behavioural
morphological
seasonal

Question 8

Describe hybrid inviability

Question 9

describe hybrid sterility