Natural Selection/Evolution Flashcards
Biodiversity in nature is important because __________.
It makes ecosystems more stable.
What can cause a species to become extinct?
The environment changes faster than a species can adapt.
Males of a species that are highly decorated (i.e., peacocks) are attempting to attract a mate and therefore __________________.
Attempting to increase their chances of producing offspring.
Evolution is the ___________.
Change in a species population over time.
The greatest factor in determining if a mutation is carried throughout a population is ______________.
Whether the mutation increases the chances of survival and reproduction.
A sudden appearance of a new structure in a species is due to _____________.
DNA (chromosome) mutation.
Small population size in a species reduces _____________.
biodiversity.
Older fossils are always found __________ younger fossils unless a geologic event misplace them.
Below.
Physical separation of species limits ____________ and _____________ between population.
gene flow and interbreeding.
Antibiotic resistance is an example of _____________ in bacteria.
natural selection or evolution
The most conclusive evidence that two different species have a common ancestor.
Similar DNA sequences.
The similar appearance of embryos from different species is evidence of ________________
Natural selection or evolution.
Mutations in DNA allow a species to _____________________.
a changing environment.
Sexual reproduction leads to ________________.
genetic diversity.
When animals are chosen to breed based of the characteristic that breeders want this is called selective breeding or _________________.
artificial selection
Animals are considered separate species when _______________.
they can no longer interbreed and produce fertile offspring.
Four things necessary for natural selection are _____________________
- Competition for limited resources.
- Variation of traits in a population.
- Traits are genetic.
- Overproduction of offspring.
A peacock showing off its tail so it will be chosen by a female is an example of _________________.
sexual selection.
A scientific theory is ______________________.
The best possible explanation that has a lot of evidence to support the statement.
When a possum plays dead, this is an example of a ____________ adaptation.,
Behavioral.
A vestigial organ is one that ____________________.
no longer serves a purpose in an organism.
Geological Isolation is a form of _____________ isolation.
reproductive
The macro-molecule that most animals use for long term storage of energy is a ________.
Lipid (fat).
