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Genetics
7th grade life science
37
Science
Not Applicable
02/07/2005

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Term
allele
Definition
the different forms of a gene
Term
autotroph
Definition
an organism that makes its own food
Term
cell cycle
Definition
the regular sequence of growth and division in cells
Term
clorophyll
Definition
a green pigment found in chloroplasts of plants, algae, and some bacteria
Term
chromatid
Definition
one of the identical rods of a chromosome
Term
chromosomes
Definition
a double rod of condensed chromatin which contains DNA that carries genetic information
Term
condominance
Definition
neither allele is dominant or recessive
Term
cytokinesis
Definition
the final stage of the cell cycle in which the cell's cytoplasm divides
Term
cytoplasm
Definition
the gel-filled region inside the cell where the first stage of repiration occurs
Term
DNA
Definition
the genetic material that contains the cell's instructions
Term
dominant
Definition
a trait that always shows up in the organism
Term
fermenation
Definition
the process by which cells break down molecules to release energy without using oxygen
Term
gene
Definition
factors that control traits
Term
genetics
Definition
the scientific study of heredity
Term
genotype
Definition
an organism's genetic makeup or allele combination
Term
heredity
Definition
the passing of traits from parents to offspring
Term
heterotroph
Definition
an organsim that cannot make its own food
Term
heterozygous
Definition
having two different alleles for a trait
Term
homozygous
Definition
have two identical alleles for a trait
Term
hybrid
Definition
an organsim that has two different alleles for traits
Term
interphase
Definition
the stage of the cell cycle in which the cell grows, copies its DNA, and prepares to divide
Term
meiosis
Definition
the process by which the number of chromosomes in sex cells is halved
Term
mitochondria
Definition
the rod shaped cell organelle that releases energy during respiration
Term
mitosis
Definition
the process by which body cell replicate
Term
mutation
Definition
a change in a gene or chromosomes
Term
phenotype
Definition
an organism's physical appearance
Term
photosynthesis
Definition
the process by which plants and some other organisms use the energy in sunlight to make food
Term
pigment
Definition
a colored chemical that absorbs light
Term
probability
Definition
the likelihood that a particular event will occur
Term
Punnet Square
Definition
a chart that shows all the possible combinations of alleles that can result form a genetic cross
Term
purebred
Definition
an organism that always produces offspring with the same form of a trait as the parent
Term
recessive
Definition
a trait that is masked or covered by a dominant allele
Term
replication
Definition
the process by which a cell makes a copy of its DNA
Term
respiration
Definition
the process by which cells break down food molecules and release the energy they contain a molecule that helps produce proteins
Term
RNA
Definition
a molecule that helps produce proteins
Term
stomata
Definition
small openings on the underside of a leaf that allow carbon dioxide and oxygen in and out
Term
traits
Definition
physical characteristics of an organsim
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