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ISC (Science) ISC Class 12 - CISCE Important Questions

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Give one significant contribution to the following scientists:

Sanger

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Chapter: [6] Molecular Basis of Inheritance
Concept: Human Genome Project

What is the central dogma?

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Chapter: [6] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Explain the mechanism of transcription in a prokaryotic cell.

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Chapter: [6] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Give four adaptations in flowers pollinated by insects.

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Adaptive Radiation

Name and define the three types of natural selection.

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Darwin’s Theory of Natural Selection (Darwinism)

The largest unit in which gene flow is possible is :

(1) Organism

(2) Population

(3) Species

(4) Genes

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Darwin’s Theory of Natural Selection (Darwinism)

List any three drawbacks of Darwinism.

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Darwin’s Theory of Natural Selection (Darwinism)

State Hardy-Weinberg’s principle.

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Hardy Weinberg’s Principle

Differentiate between Directional natural selection and Disruptive natural selection. 

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Hardy Weinberg’s Principle

Explain the evolution of the long neck of giraffe according to Charles Darwin. 

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Darwin’s Theory of Natural Selection (Darwinism)

What is the Founder's effect?

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Hardy Weinberg’s Principle

Give a mathematical expression for Hardy Weinberg's principle.

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Chapter: [8] Evidences and Theories of Biological Evolution
Concept: 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).

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: 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:

The number of homozygous dominant fruit flies.

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: 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:

The number of homozygous recessive fruit flies.

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: 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:

The number of carrier fruit flies.

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Hardy Weinberg’s Principle

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.

Appears in 1 question paper
Chapter: [8] Evidences and Theories of Biological Evolution
Concept: Hardy Weinberg’s Principle

An antiviral protein released from infected and dying cells is ______.

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Chapter: [10] Human Health and Diseases
Concept: Immunity

Expand the following: SCID

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Chapter: [10] Human Health and Diseases
Concept: Immunity

Name the antibody which is most effective in allergies.

Appears in 1 question paper
Chapter: [10] Human Health and Diseases
Concept: Immunity
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