phenotype
the physical apparent trait of an organism
pleitropy
one genetic mutation leads to many different kinds of phenotypes
Punnet Square
a chart that shows all the possible combinations of alleles that can result from a genetic cross
recessive allele
an allele only expressed in the homozygous condition
Sickle cell disease
a genetic disorder in which erythroctyes take on an abnormal curved or sickle shape
trait
a characteristic of an organism that can be passed to offspring
tay- sachs
a lysosomal storage disease also an example of incomplete dominant trait
pedigree
family tree like structure with circles representing females and squares representing males that traces the passage of genetic traits over many generations
law of segregation
pairs of genes at a single gene locus separate during gamete formation creating single individualized genes in the resultant gamete sperm or egg
incomplete dominance
heterozygotes are blended in phenotype
alleles
alternate forms of the same gene