Evolution — BIOLOGY STD 12 Science — Question

Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Boveri; with that of experimental results on pea plant presented by Mendel.

Bee keeping practice is a good income generating industry. Write the different points to be kept in mind for successful bee keeping. Write the scientific name of the most common Indian species used for the purpose.

Copper ions-releasing IUDs are more efficient than non-medicated methods. Why?

State in what ways Stanley Miller stimulated the conditions of-

1. Primitive atmosphere on earth.
2. Energy source at the time of origin of life.
3. Formation of organic molecules of life to prove the theory of chemical evolution.

A considerable amount of lactose is added to the growth medium of E.coli. How is the lac operon switched on in the bacteria? Mention the state of the operon when lactose is digested.

What is ‘semi-conservative’ DNA replication? How was it experimentally proved and by whom?

Mention the role of (i) selectable marker, (ii) Ori and (iii) rop in E.coli cloning vector, pBR 322.

In the garden pea plant, the green color of pod is dominant over the yellow color of the pod to determine the genotype of a plant of unknown genotype, use punnett square to represent the genotype and phenotype of the test cross?

Answer the following questions:
How are pea seeds different from castor seeds with respect to endosperm?