Term
|
Definition
| An alternative form of a gene. |
|
|
Term
|
Definition
| A technique for determining genetic abnormalities in a fetus by the presence of certain chemicals or defective fetal cells in the amniotic fluid, obtained by aspiration from a needle inserted into the uterus. |
|
|
Term
| Chorionic Villus Sampling |
|
Definition
| (CVS) A technique for diagnosing genetic and congenital defects while the fetus is in the uterus. A small sample of the fetal portion of the placenta is removed and analyzed. |
|
|
Term
|
Definition
| A phenotypic situation in which both alleles are expressed in the heterozygote. |
|
|
Term
|
Definition
| Having at least one common ancestor in the preceding few generations. |
|
|
Term
|
Definition
| A phenomenon in which one gene alters the expression of another gene that is independently inherited. |
|
|
Term
|
Definition
| The genetic makeup of an organism. |
|
|
Term
|
Definition
| Having two different alleles for a given genetic character. |
|
|
Term
|
Definition
| Having two identical alleles for a given trait. |
|
|
Term
|
Definition
| The mating or crossing of two varieties. |
|
|
Term
|
Definition
| A type of inheritance in which F1 hybrids have an appearance that is intermediate between the phenotypes of the parental varieties. |
|
|
Term
| Law of Independent Assortment |
|
Definition
| Mendel's second law, stating that each allele pair segregates independently during gamete formation; applies when genes for two traits are located on different pairs of homologous chromosomes. |
|
|
Term
|
Definition
| Mendel's first law, stating that allele pairs separate during gamete formation, and then randomly re-form pairs during the fusion of gametes at fertilization. |
|
|
Term
|
Definition
| The inheritance of a single character. |
|
|
Term
|
Definition
| More than two possible alleles at a locus (The position of a gene on a chromosome). |
|
|
Term
|
Definition
| The range of phenotypic possibilities for a single genotype, as influenced by the environment. |
|
|
Term
|
Definition
| A family tree describing the occurrence of heritable characters in parents and offspring across as many generations as possible. |
|
|
Term
|
Definition
| The physical and physiological traits of an organism. |
|
|
Term
|
Definition
| The ability of a single gene to have multiple effects. |
|
|
Term
|
Definition
| An additive effect of two or more gene loci on a single phenotypic character. |
|
|
Term
|
Definition
| In a heterozygote, the allele that is completely masked in the phenotype. |
|
|
Term
|
Definition
| Each variant for a character. |
|
|
