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Biology

Classification, variation and speciation

QuestionAnswer
What does Hardy-Weinberg rely on No mutations, no movement of gene pool, no naturel selction, large population, random mating
What is the Hardy-Weinberg equation? q2 + 2pq + q2 = 1
What does naturel selection result from? Differant fertility of organisms
What is the theory of naturel selction? That allele frequency will increase for the most successful gene, as they will breed mor successfully
What is directional selction? Movement of population towards diferant characteristic due to selective pressure
What causes directional selection? Environmental change
What is stabalising selction? The removal of the extremes of a gene, leaving the moderates
What causes stablising selection? it occurs naturelly in all organisms
What is disruptive selction? Removal of moderates to leave the extremes
What causes disruptive selection? Large environmental changes
What is speciation? Formation of 2 species from one
What are the two types of speciation? Allopatric and sympatric
What are the differances between the two types of speciation? Allopatric caused by geograpical sepaation, symapatric occurs within the same environment
Why can sympatric speciation occur? Mechanical isolation, gamates prevented from meeting, no fusion of gamates, hybrid inviability, hybrid sterility, behavioural isolation
What is mechanical isolation? Incompatabilty of genetalia, leads to sympatric speciation
What is hybrid inviabiity? Failure of the embryo to develop, leads to sympatric speciation
What is hybrid sterility? Inability of chromosomes to pair, leads to sypatric speciation
What happens when you move from species to kingdom? Number of organisms increases
What happens when you move from kingdom to species? Number of simularities increases
What are the 5 kingdoms? Prokaryote, Protoctista, Fungi, Plantae, Animalia
Which kingdoms contain prokaryotic cells? Prokaryotes
Which kindoms contain eukaryotic cells? Protoctista, fungi, plantae, animalia
Do prokaryotes have a cell wall? Yes
Do Protoctista have a cell wall? Some
Do Fungi have a cell wall? Yes
Do Plantae have a cell wall? Yes
Do animalia have a cell wall? No
Created by: 1988kayla
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