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Stephen Fyler 12.1

trait
Stephen Fyler 12.1

any characteristic that is inherited
Stephen Fyler 12.1

pedigree
Stephen Fyler 12.1

a graphic representation of genetic inheritance.
Stephen Fyler 12.1

carrier
Stephen Fyler 12.1

an individual heterozygous for a specific trait
Stephen Fyler 12.1

fetus
Stephen Fyler 12.1

a developing baby (or mammal) from nine weeks to birth.
Stephen Fyler 12.2

allele
Stephen Fyler 12.2

an alternative form of a gene
Stephen Fyler 12.2

incomplete dominance
Stephen Fyler 12.2

inheritance pattern where the phenotype of a heterozygote is intermediate between those of the two homozygotes; neither allele of the pair is dominant but combine and display a new trait
Stephen Fyler 12.2

codominant allele
Stephen Fyler 12.2

pattern where phenotypes of both homozygote parents are produced in heterozygous offspring so that both alleles are equally expressed
Stephen Fyler 12.2

multiple allele
Stephen Fyler 12.2

presence of more than two alleles for a genetic trait
Stephen Fyler 12.2

autosome
Stephen Fyler 12.2

pairs of matching homologous chromosomes in somatic cells
Stephen Fyler 12.2

sex chromosome
Stephen Fyler 12.2

in humans, the 23rd pair of chromosomes; determine the sex of an individual and carry sex-linked characteristics
Stephen Fyler 12.2

sex-linked trait
Stephen Fyler 12.2

traits controlled by genes located on sex chromosomes
Stephen Fyler 12.2

polygenic inheritance
Stephen Fyler 12.2

inheritance pattern of a trait controlled by two or more genes; genes may be on the same or different chromosomes
Stephen Fyler 12.3

homozygous
Stephen Fyler 12.3

having two identical alleles for a particular gene
Stephen Fyler 12.3

karyotype
Stephen Fyler 12.3

chart of metaphase chromosome pairs arranged according to length and location of the centromere; used to pinpoint unusual chromosome numbers in cells