Evolution Flashcards
Explain the 5 steps of natural selecrion
-mutation occurs so there are variations in a species
-organisms reproduce and competition occurs
-organisms with better characteristics survive
-favourable alleles passed om
-over time only organisms with these alleles will survive
What are fossil records
Remains of organisms from millions of years ago
Why might there be gaps in the fossil records
-early life forms were soft-bodied so they decayed
-been destroyed by geological activity like tetonic plates
What is extinction
When no remaining individuals of a species are alive
What individuals become extinct
-those that are poorly adapted and are less likely to reproduce
Why might a species become extinct?
-new diseases
-new predators
-environmental changes
-one single catastrophic event
How often does bacteria reproduce
Every 20 minutes
What are antibiotics
Chemicals that can kill bacteria
The 4 steps to natural selection in bacteria?
-mutation occurs, some bacteria is resistant, some is not
-resistant bacteria does not die when treated w antibiotics
-genes from thus bacteria are passed on
-eventually the whole population becomes antibiotic resistant
What is binary fission
How bacteria reproduces
Who made the classification system
Linnaeus
What is the mnemonic for classification system
King. Philip. Came. Over. For. Gran’s. Spagetti
What are the stages of the classification system
Kingdom. Phylum. Class. Order. Family. Genus. Species
When naming organisms what is the Genus
The first word
When name organisms what is the Species
The 2nd word
