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Definitions for 3rd 9 weeks
S Schneider
13
Science
7th Grade
03/09/2010

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Term
Allele
Definition
alternate form that a gene may have for a single trait
Term
Dominant
Definition
describes a trait that covers over another form of that trait
Term
Recessive
Definition
describes an trait that is dominanted by another form of that trait, it seems to disappear
Term
Heterozygous
Definition
describes an organism that has two different alleles for a trait
Term
Homozygous
Definition
describes an organism with two different alleles that are the same for a trait
Term
DNA
Definition
deoxyribonucleic acid which is the genetic material of all organisms, made up of two twised strands of sugur-phosphate molecules and nitrogen bases.
Term
Gene
Definition
section of DNA on a chromosome that contains instructions for making specific proteins
Term
Protein
Definition
made up of amino acids and build cells and tissues or work as enzymes
Term
Heredity
Definition
the passing of traits from one parent to offspring
Term
Trait
Definition
an inherited characterisic from one parent to offspring
Term
Genetics
Definition
the study of how traits are inherited through the actions in alleles
Term
Genotype
Definition
an organisms genetic makeup
Term
Phenotype
Definition
outward physical appearance and behavior of an organism
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