Are We a Product of Nature or Nurture?

Are we a product of Nature or Nurture?

Direct Selection:
• One extreme favoured – current optimum for existing conditions
• Environmental change produce new selection pressure - favours extreme condition
• Change in condition = optimum sifts to favour new optimum
• Some organism possess allele that favours new optimum
• Over time selection -> pre dominate of organisms new optimum and therefore optimum shifts

Stabilising Selection:
• Occurs in all population where environment is stable
• Selection pressure at both ends of distribution
• Favours optimum/ average
• Eliminates extremes
• Reduce variably + size of range in optimum and therefore reduce opportunity for evolutionary change
-Interspecific competition
-Organism produces offspring – requires resources e.g. light, food, space
-Variation in alleles already exist within population (gene pool) – due to mutation
-Some individuals possess better combination of alleles making them more likely to survive completion – advantageous allele (better adaptation to survive
-Selection pressures – e.g. predation, disease -> differential survival
- Those who survive reproduce – passing on its alleles = causes change in allele frequency
- due to completion population remains constant

Mutation  Selection
- Environment provides selection pressure = NURTURE
- Mutation provides biological cause = NATURE

Nurture:
- Farming, animals are chosen due to their advantageous characteristics
- Genes - animals with advantageous allele are bred to produce most biomass

Nature:
- Natural selection for advantageous allele
- Animals with advantageous allele able to survive and reproduce passing on its allele

Mutation produces new alleles and variation by changing the sequences of bases in a gene
Mutation occur naturally in processes such as DNA replication by substitution or deletion
Cystic Fibrosis – caused by deletion mutation of the recessive allele where three A-A-A bases are missing