B2a-classification Flashcards
Why is it difficult to place organisms into distinct groups?
The variety of life is a continuous spectrum
Many organisms share characteristics of multiple groups
What are kingdoms subdivided into?
Kingdom (krypton) Phylum (prevents) Class(clark) Order(on) Family(fighting) Genus(genius) Species(super-villains)
What is classification?
Organising living organism into groups
Why are classification systems important?
They help us to understand how organisms are related(evolutionary relationships)
How they interact with each other(ecological relationships)
What are natural classification systems?
Based on evolutionary relationships and genetic similarities between organisms
What are artificial classification systems?
Based on appearance rather than genes
They’re used to identify organisms
How does DNA sequencing affect classification systems?
Allows us to see genetic differences between groups
We can find out that two groups weren’t closely related or they were
What are the different classes of arthropods?
Insects
Arachnids
Crustaceans
Myriapods
What do evolutionary trees show us?
Common ancestors
Relationships between species
how has ICT helped the study of characteristics?
studying lots of characteristics for a large group of organisms involves analysing huge amount of dna data
what is a species?
a group of organisms which can interbreed to produce fertile offspring
what can organisms of the same species show?
may show great variation
have more features in common than they do with organisms of a different species
what is the binomial system?
a way to name species
first part refers to genus of of organism
second part refers to species
why is the binomial system important?
used by scientists all over the world
scientists in different countries or who speak different languages can refer to particular species by the same name
avoids confusion
what are the problems with classifying organisms into species?
hybrids- infertile but bred from two different species eg mule
organisms that reproduce asexually-no interbreeding
evolution as a continuous process-organisms change
