an example of a human trait that is controlled by more than one gene.
a person who has one recessive and one dominant allele for a trait.
is the crossing of two individuals that have similar characteristics.
the transfer of genes from one organism to another.
a chart that tracks which members of a family have a particular trait.
represents a male in a pedigree
an abnormal condition that a person inherits through genes or chromosomes.
people with an extra copy of chromosome 21.
all the DNA in one cell of a diagram.
professionals who help couples understand their chances of having a child with a particular genetic disorder.
breeders cross two genetically different individuals.
an organism that is genetically identical to the organism from which it was produced.
inserting work copies of a gene directly into the cells of a person with a genetic disorder.
three or more forms of a gene that code for a single trait.
sex-linked recessive genes (such as hemophilia) are very common in males.
a genetic disorder in which the body produces abnormally thick mucus.
the process of selecting a few organisms with desired traits to serve as parents of the next generation.
a person's DNA is cut into fragments.