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Inheritance terms
DHS N5 Inheritance and variation terms and definitions
| Term | Definition |
|---|---|
| Discrete Variation | Differences between members of the same species which allows them to be put into seperate, distinct groups. |
| Continuous Variation | Differences between members of the same species which have a range of values between two extremes. |
| Gene | A small area of a chromosome which contains the instructions to make the proteins needed to control a particular characteristic. |
| Homozygous | A genotype which contains 2 identical alleles. |
| Heterozygous | A genotype which contains 2 different alleles. |
| Alleles | The different forms of a gene for a particular characteristic; which cause the variations seen in a single characteristic. |
| Phenotype | The physical characteristics displayed by an organism. |
| Genotype | The alleles present within an individual for a particular characteristic. |
| Dominant Characteristic | A characteristic which can cover the effect of another characteristic. |
| Recessive Characteristic | A characteristic whose effect has been covered by a dominant characteristic |
| Family Tree | A diagram which shows the expression and passage of a characteristic through a number of generations of the same family |
| Genetic Counselling | The process by which people at risk of an inherited disorder are advised of the consequences and nature of the disorder, the probability of developing or passing it on. |
| Polygenic Inheritance | Characteristics which are controlled by 2 or more different genes. |
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