Apart from being a part of the food chain, predators play other important roles. Mention any two such roles supported by examples.
Predators play an important role in:
1. Maintaining the prey population and regulating intra-species competition. For example, if tigers are removed from a forest, spotted deer will multiply rapidly.
2. Indicating ecological disturbances. Usually, predators are small in number and highly sensitive to ecological changes, owing to their excessive adaptation. For example, Gharials (freshwater predators) start dying rapidly as soon as a river starts getting polluted, thus indicating a disturbance in the ecosystem.
State how Agrobacterium tumifaciens has been made a useful cloning vector to transfer DNA to plant cells.
Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type
(i) Female XX with Male XO
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type
(ii) Female ZW with Male ZZ