A recessive trait is observed when an organism has 2 recessive genetic factors.
Answer:
selective and differential medium
Explanation:
Based on chemical composition, there are different type of media for the cultivation of bacteria:
- Basal media: culture media that needs no enrichment before being used for bacteria cultivation.
- Enriched media: culture media that are enriched with the addition of blood, serum or egg before being used for culturing.
- Selective media: These are media that selectively favour the growth of a bacterium or group of bacteria over others.
- Differential media: Also known as indicator media. They contain a special substance that changes colour to indicate the presence of a bacterium or group of bacteria.
- Transport media: Media that are used in transporting bacteria from point of collection to where they will be cultured.
- Storage media: These are media that are used to store organisms for future use.
<em>Mannitol salt agar selectively favours the growth of the genus Staphylococcus and inhibits the growth of other organisms. It also contains mannitol which gets fermented and change colour to indicate a particular species of the genus. </em><em>Hence, mannitol salt agar could be classified as a selective and differential medium</em>
A polymer composed of many glucose units
