click below
click below
Normal Size Small Size show me how
Genetics CC
| Term | Definition |
|---|---|
| Species | Organisms capable of interbreeding and producing fertile offspring. |
| Heredity | The passing on of traits from parent to offspring by means of genes |
| Gene Expression | The process of using the information on the gene to make a protein |
| Gene | A unit of DNA which codes for the production of a specific protein |
| DNA profiling | Examining DNA for a pattern or band to compare against the DNA of another person. |
| Coding dna | That part of the chromosome which carries the infomation to make a protein |
| Non-coding dna | That part of the chromosome which does not carry the infomation to make a protein |
| Genetic screening | Testing for the presence of a specific gene to establish the presence or absence of that gene |
| Transcription | The process of producing mRNA using DNA as a template. |
| Translation | The process of making a protein using the mRNA code a template |
| Gamete | A haploid sex cell which is capable of fusion |
| Fertilisation | The fusion of 2 haploid gametes to form a diploid zygote |
| Allele | An alternative form of a gene |
| Homozygous | Has identical alleles for a trait |
| Heterozygous | Has different alleles for a trait |
| Genotype | The genetic make-up of an individual |
| Phenotype | Physical appearance of an organism |
| Dominance | One allele masks the expression of the other. |
| Recessive | Allele whose expression is masked by dominant allele |
| Incomplete Dominance | Neither allele masks the expression of the other. |
| Variation | Difference between members of species or population |
| Mutation | Change in the genetic make up |
| Genetic engineering | Manipulation or alteration of genes |
| Evolution | Inheritable change within a population or species in response to change in the environment by natural selection over time |
| Mendel’s 1st Law[Segregation] | Traits are controlled by pairs of alleles which separate at gamete formation. Each gamete carries only one allele for each trait |
| Mendel’s 2nd Law[Ind.Assortment] | During gamete formation each member of a pair of alleles may combine randomly with either of another pair |
| Linkage | Genes located on the same chromosome |
| Sex Linkage | Gene located on X- chromosome or on Y-chromosome |
| Non-nuclear Inheritance | DNA apart from that found in the nucleus e.g. mitochondria that is passed on to the next generation |