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Biology Ch. 12.2
Term | Definition |
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pedigree | A diagram that shows the occurrence of a genetic trait in several generations of a family |
carrier | In biology, an individual who has one copy of a recessive autosomal allele that causes disease in the homozygous condition |
genetic disorder | An inherited disease or disorder that is caused by a mutation in a gene or by a chromosomal defect |
polygenic | A characteristic of an organism that is determined by many genes |
complex character | A character such as skin color that is influenced strongly by both genes and the environment |
multiple allele | More than two alleles (versions of the gene) for a genetic trait |
codominance | A condition in which both alleles for a gene are fully expressed |
incomplete dominance | A condition in which a trait in an individual is intermediate between the phenotype of the individual's two parents because the dominant allele is unable to express itself fully |
sex-influenced trait | An autosomal trait that is influenced by the presence of male or female sex hormones |
Huntington's disease | A rare hereditary disease of the brain characterized by involuntary movements of the limbs or face, decreasing mental abilities, and eventual death |
amniocentesis | A procedure used in fetal diagnosis in which amniotic fluid is removed from the uterus of the pregnant woman |
chorionic villi sampling | A procedure in which the chorionic villi to are analyzed to diagnose fetal genotypes |
genetic counseling | The process of testing and informing potential parents about their genetic makeup and the likelihood that they will have offspring with genetic defects or hereditary diseases |
gene therapy | A technique that places a gene into a cell to correct a hereditary disease or to improve the genome |