click below
click below
Normal Size Small Size show me how
Genetics
Review for unit test
| Term | Definition |
|---|---|
| heredity | the passing of traits from parents to offspring |
| allele | the different forms a gene may have for a trait |
| genetics | the study of how traits are inherited |
| dominant | form of a trait that appears to mask another form of the same trait |
| recessive | form of a trait that seems to disappear in a population, but can reappear |
| Punnett square | tool used to predict results in Mendelian genetics |
| genotype | genetic makeup of an organism |
| homozygous | organism with two identical alleles for a trait |
| heterozygous | organism with two different alleles for a trait |
| phenotype | physical trait that shows as a result of a particular genotype |
| incomplete dominance | production of a phenotype that is intermediate to those of the two homozygous parents |
| Gregor Mendel | Austrian monk father of genetics |
| sex-linked gene | an allele inherited on a sex chromosome |
| genetic engineering | methods for changing the DNA sequence that makes up a gene |
| probability | branch of mathematics that helps you predict the chance that something will happen |
| pedigree | tool for tracing the occurrence of a trait in a family |
| gene | a unit of genetic material that determines a trait(located on chromosomes-specific areas on a chromosome |
| meiosis | cell division that happens in sex cells only. produces gametes have one set of unpaired chromosomes |
| mitosis | body cell division |
| mutation | a change in DNA or chromosomes. |
| zygote | sex cells that have been fertilized resulting in a cell with a full set of chromosomes(a diploid cellformed by union of sperm and egg) |
| Homozygous recessive | eg., aa |
| Homozygous dominant | eg., AA |
| Heterozygous dominant | eg., Aa |
| trait | Characteristic that is inherited. |
| Chargaff's Law | A-T and C-G |