unit 1
what is an observation?
An observation is information gathered by using the senses.
what is an organism?
An organism is an individual life-form consisting of one or more cells in which the processes of life are conducted.
what is the observable form of a trait?
the phenotype
what is the oldest era according to the geologic time scale?
the Precambrian era.
what are behavioral adaptation?
Behavioral adaptations are behaviors or activities performed by an organism that increases its fitness.
what is an inference?
an inference is an explanation for an observation.
what do you call an organism with a single cell?
a unicellular organism.
what is a ratio?
the comparison of one quantity to another.
what were the first organisms on Earth?
single-celled prokaryotes.
what are Innate behaviors?
Innate behaviors occur naturally in an organism. Innate behaviors are not learned. They are genetically inherited.
what is the smallest basic unit of a chemical element?
an atom.
what do you call an organism with different types of cells with specialized shapes and functions?
a multicellular organism.
what is a genotype composed of two identical alleles?
homozygous.
what is a mass extinction?
Mass extinction is when a large number of species die out in a relatively short period of time.
what are learned behaviors?
Learned behaviors are activities or behaviors that are acquired by an organism through experience.
what is matter?
anything that has mass and takes up space.
Which are unicellular organisms
a bacterium, a cat, yeast, a parrot?
a bacterium and yeast
what is a Punnett square?
Punnett squares are diagrams used to show possible genotypes that can result from a cross between two parents.
what is variation in biology?
when there are phenotypic differences in organisms in the same species
what do you call it when an organism moves from one region to another?
migration.
what do you call a substance that is formed when two or more atoms join together
a molecule.
who created a model that showed the structure of DNA?
Watson and Crick
what is a pedigree?
A pedigree is a diagram that illustrates the inheritance of a specific trait through the generations.
what is a favorable trait?
a characteristic that leads to an organism being more fit.
what is dormancy?
a state of inactivity in organisms, where growth and development are paused.