Write the types of sex-determination mechanisms the following crosses show. Give an example of each type

(i) Female XX with Male XO

State how Agrobacterium tumifaciens has been made a useful cloning vector to transfer DNA to plant cells.

State the disadvantage of inbreeding among cattle. How it can be overcome?

Write the types of sex-determination mechanisms the following crosses show. Give an example of each type

(ii) Female ZW with Male ZZ

Explain with the help of a suitable example the naming of a restriction endonuclease.

Explain the basis on which he arrived at this conclusion.

How are 'sticky ends' formed on a DNA strand? Why are they so called?

Apart from being a part of the food chain, predators play other important roles. Mention any two such roles supported by examples.

Construct an age pyramid which reflects a stable growth status of human population.

Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.