species and taxonomy Flashcards
what is the definition of of species
2 organisms are of the same species if they can breed to produce fertile offspring
what would happen if two animals of different species bred
Offspring would not be fertile
If the offspring of two different species has an uneven number of chromosomes what will happen?
Chromosomes will not be able to line up in homologous pairs so meiosis can’t happen to produce gametes
What is courtship behaviour?
Organisms can recognise individuals of the same species through courtship behaviours. These behaviours attract the same species mate of the opposite sex and form a pair bond.
Why is courtship behaviours important?
Call chip is important as they are able to produce fertile offspring if not the species would become extinct
what are the levels of the classification system?
Domain kingdom, phylum class order family genus species
what is phylogenetics
Classification of organisms into group based on their evolutionary origins and relationships
what evidence do we use for Phylogenetics?
Physical appearance
Courtship behaviour
DNA base sequence
Amino acid sequences in key proteins
Antibody variable region shapes
The classification system is an example of what?
A hierarchy
It is made up of large groups broken down into progressively smaller groups with no overlapping
What are the three ways in which courtship behaviour increases probability of successful mating/ producing fertile offspring?
stimulates gamete production
Attracts the opposite sex
attracts the same species
what is a hierarchy
classifying animals into smaller groups each time without overlapping of groups
what does a phylogenetic tree and concentric circle show
evolutionary relationships between species, sharing common ancestors
