section of DNA that codes for a protein and determines a trait
specific characteristic that varies from one individual to another
trait that will show up in an organism's phenotype if gene is present
trait that will only appear in the phenotype if organism inherits two of them; covered up by the dominant gene
separation of alleles during meiosis or gamete formation
sex cell; sperm or egg
offspring of a cross between parents with different traits; heterozygous
inherited two identical alleles for a trait; homozygous or purebred
likelihood an event will occur
physical characteristics of an organism
diagram that shows the possible results of a genetic cross; parents' gametes on top and left, offsprings' genotypes inside
genetic makeup of an organism
has two identical alleles for a particular trait; true-breeding or purebred, ex. PP or pp
has two different alleles for a particular trait; hybrid, ex. Pp
principle that genes do not influence each other's inheritance because they are separated independently during meiosis
three or more alleles exist for a particular trait
creates a blended phenotype; one allele is not completely dominant over the other
trait controlled by two or more genes; shows a wide variety of phenotypes
both genes contribute to the phenotype of the organism, ex. spotted or striped
error in meiosis in which homologous chromosomes don't separate; gametes end up with wrong number of chromosomes
trait related to a gene that is found on the X or Y chromosomes
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