7th Science Vocab by Alison
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Created by:
lvascience on March 5, 2012
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22 terms
Terms | Definitions |
|---|---|
 Heredity | The passing of physical characteristics from parents to offspring |
| Trait | Each different form of a characteristic, such as stem height or seed color |
| Genetics | Scientific study of heredity |
| Fertilization | When a new organism begins to form when egg and sperm cells join together |
| Purebred | The offspring of many generations that have the same form of a trait |
| Gene | Factors that control a trait (contains 2 alleles) |
| Alleles | The different forms of a gene |
| Dominant Allele | One whose trait always shows up in the organism when the allele is present |
| Recessive Allele | Hidden whenever the dominant allele is present |
| Hybrid | An organism that has 2 different alleles for a trait |
| Probability | A number that describes how likely it is that an event will occur |
| Punnett Square | Chart that shows all the possible combinations of alleles that can result from a genetic cross |
| Phenotype | An organism's physical appearance or visible traits |
| Genotype | An organism's genetic makeup, or allele combinations |
| Homozygous | An organism that has 2 identical alleles for a trait (purebred) |
| Heterozygous | An organism that has 2 different alleles for a trait (hybrid) |
| Codominance | When both alleles for a gene are expressed equally |
| Incomplete Dominance | When one allele is only partially dominant |
| Polygenic Inheritance | When more than one gene affects a trait |
| Inherited Trait | Trait someone is born with |
| Acquired Trait | Trait that is caused by physical action (environment) Not born with it |
| Meiosis | Process by which the number of chromosomes is reduced by half to form sex cells- sperm and eggs |
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