Human Genetic Defects

Genetic defects can be the result of recessive alleles or chromosomal abnormalities. Nondisjunction is an example of a chromosomal abnormality. Deletion (where portions of chromosomes are deleted), duplication (where portions of chromosomes are duplicated), translocation (where portions are moved to another chromosome), and inversion (where portions are arranged in reverse orientation on the same chromosome) are all examples of chromosomal abnormalities.