Genotype
genetic constitution make up of an organism
determines the limits within which characteristicsmay vary
Phenotype
appearancecharacteristicdue tointeractionsbetweengenotype environmen
Gene
a lengthof DNAthatcodes for the sequence ofaminoacids of a polypeptide
Allele
one of the different formsof a gene
Locus
position of a gene on a DNA molecule
Homologouschromosomes
chromoses occur in pairs in diploidorganisms calledhomologouschromosome
onechromose from each parent
2 loci each carry one allele of a gene
Homozygous
allele on each of thechromosomes is the same
Heterozygous
Salles on each of the twochromosomes is different
Dominant allele
alwaysexpressed in phenotype
Recessive allele
onlyexpressed in phenotype when homozygous12alles present
codominance
both alleles are expressedin phenotype
sex linked gene
gene located on one sex chromosome X or Y
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