Populations & Traits
What is a population?
A GROUP OF THE SAME TYPE OF ORGANISM LIVING IN THE SAME AREA.
What is variation?
ANY DIFFERENCE IN TRAITS BETWEEN INDIVIDUAL ORGANISMS.
What is an adaptive trait?
A TRAIT THAT MAKES IT MORE LIKELY THAT AN INDIVIDUAL WILL SURVIVE IN A SPECIFIC ENVIRONMENT.
What is natural selection?
THE PROCESS BY WHICH THE DISTRIBUTION OF TRAITS IN POPULATION CHANGES OVER MANY GENERATIONS.
What is a gene?
INSTRUCTION FOR MAKING PROTEIN MOLECULES.
What is a trait?
A SPECIFIC CHARACTERISTIC OF AN INDIVIDUAL ORGANISM.
The environment is...
EVERYTHING LIVING AND NONLIVING THAT SURROUNDS AN ORGANISM.
What is non-adaptive trait?
A TRAIT THAT MAKES IT LESS LIKELY THAT AN INDIVIDUAL WILL SURVIVE IN A SPECIFIC ENVIRONMENT.
Individuals with adaptive traits are more likely to...
REPRODUCE.
What determines traits?
PROTEIN MOLECULES.
What is a generation?
A GROUP OF INDIVIDUALS BORN AND LIVING AT ABOUT THE SAME TIME.
What causes changes in trait distribution?
ENVIRONMENTAL CHANGES.
What happens to adaptive traits over time?
THEY INCREASE IN A POPULATION.
THEY BECOME MORE COMMON.
Over many____________, adaptive traits become more common.
GENERATIONS.
Individuals inherit what specifically from their parents?
GENES.
What is distribution?
THE NUMBER OF INDIVIDUALS WITH EACH TRAIT IN A POPULATION.
What determines if a trait is adaptive?
THE ENVIRONMENT.
Why do non-adaptive traits decrease?
Environmental conditions explain the changes in the distribution of traits in populations.
What is the CAUSE?
What is the EFFECT?
CAUSE = ENVIRONMENT/ENVIRONMENTAL CONDITIONS
EFFECT = CHANGES IN TRAIT DISTRIBUTION
What is a mutation?
What does it create sometimes?
A RANDOM CHANGE IN A GENE.
SOMETIMES RESULTS IN A NEW TRAIT.
How can a population be described?
A POPULATION CAN BE DESCRIBED BY THE TRAITS PRESENT (VARIATION) AND THE NUMBER OF INDIVIDUALS WHO HAVE EACH TRAIT (DISTRIBUTION).
The traits that exist in a population determine which traits can become ________________ over many generations.
MORE COMMON.
TRUE or FALSE
A trait be adaptive in one environment but not another.
TRUE.
Individuals with __________ traits are more likely to live ________ and have offspring.
Individuals with __________ traits are more likely to _______ without having offspring.
ADAPTIVE; LONGER.
NON-ADAPTIVE; DIE.
Why are mutations important?
THEY INTRODUCE NEW TRAITS IN A POPULATION.