Genetic Information Variation And Relationship Between Organisms Flashcards
(13 cards)
What does crossing in meiosis cause ?
Exchange in material between mine sister chromatids (variation)
Define genetic diversity
Difference in alleles between individuals within a population
Define population
Group of organisms of one species living in a habitat
Define directional and stabilising selection
•Directional- mean moves towards an extreme
•stabilising- mean moves towards an average
Define species
Organisms that can successfully breed with each other to produce fertile offspring
What makes a successful reproduction
•takes place between same species
•both sexually mature
•synchronised mating
•form pair bond
Define gene pool
Number of alleles in a particular population at a particular time
What is artificial classification
Divides organisms by physical characteristics not same evolutionary origins
What is natural classification
Classifies species with shared features from ancestors it’s based upon evolutionary relationships
Define species genetic and ecosystem diversity
Species -variety of different species and individuals of each species
Genetic -variety of alleles
Ecosystem -range of different habitats
Define phylogenetic classification
Species with common ancestor
What lowers species diversity
Monoculture - only one crop farmed
Pesticides/herbicides-kills organisms
No intercropping - drains nutrients
What causes adaptation
Random mutations causing sequences of bases to change
