ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Biology (Theory)

Define Apomixis.

State Hardy-Weinberg’s principle.

Differentiate between Directional natural selection and Disruptive natural selection. 

What is the Founder's effect?

State Hardy Weinberg's principle.

Give a mathematical expression for Hardy Weinberg's principle.

A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:

Frequency of the allele (A).

A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:

The number of homozygous dominant fruit flies.

A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:

The number of homozygous recessive fruit flies.

A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:

The number of carrier fruit flies.

The black colour on the beak of finches dominates over the yellow colour. There are 210 individuals with the genotype DD, 245 individuals with the genotype Dd and 45 individuals with the genotype dd. Deduce the frequency of individuals with dominant, heterozygous, and recessive traits.

Define Parthenocarpy

The diagram given below is the L.S. of a typical fruit.

1. Identify the parts labelled '1', '2' and '3'.
2. State the difference between a true fruit and a false fruit.
3. What is the significance of the formation of fruit in angiosperms?

What is the advantage of growing apomictic seeds in crop improvement?

The genotype of a person withTumer's syndrome will be:
(i)   44+XXY
(ii)  44+XYY
(iii) 44+XO
(iv) 44+XXYY

What is the genotype of Turner's Syndrome?

Mention any one symptom of Turner's syndrome.

Jacob is genetically a carrier of the disorder that affects the shape of the RBCs, as shown in the diagram below. His son James suffers from the same disorder.

1. Give the biochemical reason for the disorder that changes the shape of the RBCs, as shown above.
2. Draw a Punnett square to show the genotype of the mother of James.
3. Name and define the type of 'point mutation' responsible for this disorder.

If a person shows the production of interferons in his body, then he is suffering from ______.

Discuss the various In-situ and Ex-situ strategies for conservation of biodiversity.