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SLS Science 9 ETG
Chapter 4 and Salmon Vocab
| Term | Definition |
|---|---|
| Chromosome | a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes. |
| DNA | deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information. |
| Gene | n informal use) a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring. "proteins coded directly by genes" |
| Gene Mutation | point mutation: (genetics) a mutation due to an intramolecular reorganization of a gene |
| Gene Therapy | he transplantation of normal genes into cells in place of missing or defective ones in order to correct genetic disorders. |
| Mutagen | an agent, such as radiation or a chemical substance, that causes genetic mutation. |
| Negative Mutagen | A mutation whose gene product adversely affects the normal in a negative way |
| neutral mutation | A mutation whose gene product adversely affects the normal in a neutral way |
| nucleolus | a small dense spherical structure in the nucleus of a cell during interphase. |
| nucleus | the central and most important part of an object, movement, or group, forming the basis for its activity and growth. |
| positive mutation | A mutation whose gene product adversely affects the normal in a positive way |
| protein | any of a class of nitrogenous organic compounds that consist of large molecules composed of one or more long chains of amino acids and are an essential part of all living organisms, esp. as structural components of body tissues such as muscle, hair, colla |
| anadromous | (of a fish, such as the salmon) migrating up rivers from the sea to spawn. |
| spawn | (of a fish, frog, mollusk, crustacean, etc.) release or deposit eggs. |
| natal stream | (Natal streams) The stream in which a fish was born, where it returns to spawn. |
| alevin | a newly spawned salmon or trout still carrying the yolk. |
| fry | refers to a recently hatched fish that has reached the stage where its yolk-sac has almost disappeared and its swim bladder is operational to the point where the fish can actively feed for itself |
| smolt | a young salmon (or trout) after the parr stage, when it becomes silvery and migrates to the sea for the first time. |
| milt | the semen of a male fish. |
| A.T.U | accumulated thermal units. |
| redd | the nest that a female salmon digs into the bottom of a stream to lay eggs |
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