Yr 2 Definitions Flashcards
species
A group of organisms that are able to produce fertile offspring
species richness
the number of different species in a community/ecosystem
genetic diversity
number of different alleles of each gene
phylogenetic group
grouped according to evolutionary relationship/ common ancestry
hierarchy
A hierarchal system is one in which larger groups contain smaller groups with no overlap
transcriptional factor
protein/ molecule that moves from cytoplasm to DNA; and binds to a promoter; allowing RNA polymerase to work
codon
Triplet / three bases on mRNA/DNA; that code for an amino acid
ecological niche
The role that an organism plays in its habitat; including its use of resources and its inter-relationships with other species
abiotic factor
A non-living factor
What is succession
change in community over time;
either due to abiotic factors or due to species present
a climax community
a stable community where there is no further succession
negative feedback
where a change triggers a response which reduces the effect of a change
homeostasis
maintaining a constant internal environment
DNA probe
Single-stranded DNA; with base sequence complementary to DNA to be identified; which is radioactively / fluorescent labelled so that it can be detected
phenotype
Appearance due to genotype and the environment
