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Week 11 Mendel
Basic genetics vocabulary
| Question | Answer |
|---|---|
| genetics | the scientific study of heredity |
| true-breeding | term used to describe organisms that if allowed to self-pollinate would produce offspring identical to themselves |
| trait | a specific characteristic that varies from one individual to another |
| hybrid | offspring of crosses between parents with different traits |
| gene | sequence of DNA that codes for a protein and therefore determines a trait |
| allele | one of a number of different forms of a gene |
| segregation | the separation of alleles during gamete formation |
| gamete | specialized cell involved in sexual reproduction; sex cell |
| sperm | gamete produced by meiosis in the male |
| egg | gamete produced by meiosis in the female |
| dominant | stronger form of a trait that will always be expressed if it is present. Represented with a capital letter |
| recessive | weaker form of a trait that will be expressed only if the dominant form is not present. Represented with a lowercase letter. |
| homozygous | term used to refer to an organism that has two identical alleles for a particular trait |
| heterozygous | term used to refer to an organism that has two different alleles for the same trait |
| phenotype | physical characteristics of an organism |
| genotype | genetic makeup or allele letter combination of an organism |
| independent assortment | independent segregation or separation of genes during the formation of gametes |
| incomplete dominance | situation in which one allele is not completely dominant over another |
| probability | the likelihood that a particular event will occur |
| Punnett Square | diagram showing the gene combinations that might result from a genetic cross |
| codominance | situation in which both alleles of a gene contribute to the phenotype of the organism |
| multiple alleles | three or more alleles of the same gene |
| polygenic trait | trait controlled by two or more genes |
| gene map | diagram showing the relative locations of each known gene on a particular chromosome |