ISC (Science) ISC Class 12 - CISCE Question Bank Solutions

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.

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. 

State any three goals of the human genome project.

Give one significant contribution to the following scientists:

Sanger

An aqueous solution containing 12.48 g of barium chloride (BaCl₂) in 1000 g of water, boils at 100.0832°C. Calculate the degree of dissociation of barium chloride. 
(K_b for water = 0.52 K kg mol⁻¹, at. wt. Ba = 137, Cl = 35.5)

An aqueous solution containing 12.50 g of barium chloride in 1000 g of water boils at 373.0834 K. Calculate the degree of dissociation of barium chloride.

Given K_b for H₂O = 0.52 K kg mol⁻¹; molecular mass of BaCl₂ = 208.34 g mol⁻¹.

A 2 molal solution of sodium chloride in water causes an elevation in the boiling point of water by 1.88 K. What is the value of Van’t Hoff factor? What does it signify? [K_b = 0.52 K kg mol⁻¹]

Name the law or principle to which the following observations confirm:

When 9650 coulombs of electricity is passed through a solution of copper sulphate, 3.175 g of copper is deposited on the cathode (at. wt. of Cu = 63.5).