Populations and evolution

Question 1

Gene pool

Answer 1

All the alleles of all the genes of all the individuals in a population at a given time.

Question 2

Allelic frequency

Answer 2

The number of times an allele occurs within the gene pool

Question 3

Hardy-Weinberg principle

Answer 3

Calculates the frequencies of the alleles of a particular gene in a population

Question 4

Assumption of the HW principle

Answer 4

Proportion of dominant and recessive alleles of any genes in a population remains the same from one generation to the next.

Question 5

What conditions are required for the assumption to occur?

Answer 5

• No mutations
• Population is isolated = no flow of alleles
• No selection = equal chance for all alleles to be passed
• Large pop
• Random mating

Question 6

What is variation in the phenotype due to?

Answer 6

• Genetic

- Environmental factors

Question 7

Types of variation?

Answer 7

• Mutation
• Meiosis
• Random fertilisation of gametes

Question 8

Environmental influences

Answer 8

Affect the way the organism’s genes are expressed, genes do have limits tho. MOSTLY ENVIRONMENT.

• Climatic conditions
• Soil conditions
• pH
• Food availability