Populations Flashcards
variation exists within…
populations
a trait is a product of…
gene expression
what is the source of variations?
mutations
what is a mutation?
a permanent change of DNA
mutations present in ……. are passed from parent to offspring
gametes
what are the three types of adaptation and what do they mean?
structural- physical traits
behavioural- how the organism acts
physiological- an internal process
what is adaptation?
a trait variation that leads to increased survivability
what is interspecific competition?
competition between individuals of different species with overlap in their niche
what is intraspecific competition?
competition between individuals of the same species
what was Lamarck’s idea?
“use or disuse.” that an organism will change throughout its life (length of giraffes neck would grow the more it stretched)
what was Wallaces and Darwins ideas?
that organisms are born with favoured traits and will pass that trait onto their offspring (giraffes born with a long neck will pass their traits to their babies)
what are the five areas of evidence?
fossil record, biogeography, comparative anatomy, embryology, biochemistry
what does fossil record mean?
looking for records of fossils withn layers of rocks
what does biogeography mean?
the study of global species distribution
what are characteristics of homologous structures?
may have different structures but share evolutionary origin
