Quizlet vocab 1
Species
A group of organisms that possess similar genes and traits which no other group possesses
collection of all the genes
Genotype
Can natural selection occur if there is no genetic variation?
No
If two baby mice have different colors of fur, what do we know about their genes?
They have different hair genes
Genetic Variation
Slight differences in an organism's traits that are considered normal
An allele that is masked when a dominant allele is present so it is NOT expressed
Recessive
Explain where to find the oldest fossils in the layer of the Earths crust.
The first layer.
When the population of one phenotype is much higher than another, what could we say about why this might be happening?
Phenotype
An organism's physical appearance, or visible traits
Different forms of a gene (one from mother and one from father)
Allele
Are dominant genes always the ones with the highest frequency in a population?
No
List some events that could trigger the process of natural selection:
Food supply, Natural disasters, Change in climate, predators, and new species.
Natural Selection
A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
An allele that is always expressed
Dominant
If an organism has both the dominant and recessive allele for a trait in it genotype, which trait will show in its phenotype?
Dominant
Explain how some fossils show species in lower layers that we don't see today.
They have been buried over years and went extinct.
Environmental Pressure
The factors in an ecosystem that make it hard to survive and reproduce (food, predators, temperature, mates). Also called "selective pressure"
n organism's physical surroundings, such as food supply, soil, weather, water, trees, and mountains
Environment
Because of genetic variation same cactus plants can live when the weather is hot and dry. If the weather is hot and dry is it likley that the plant will pass its genes?
Yes
A species of fish eats a particular species of coral on the reef. Explain what would happen to the fish if all the coral died in a hurricane.
They will have no food supply, won't be able to eat, and will probably go extinct.