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ISC (Science) ISC Class 12 - CISCE Important Questions for Biology (Theory)

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मुख्य विषय
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Biology (Theory)
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Consider the following information and answer the question that follows:

  • Reshma’s mother is normal, but her father is suffering from PKU.
  • Reshma is suffering from PKU. She has two younger brothers who are identical twins; both are suffering from PKU. Reshma’s two elder sisters are normal.
  • Reshma marries Robert, who is normal. Reshma gives birth to a son named Jason who is normal. After some time, Reshma and Robert have two more children: a daughter with symptoms of PKU and a son without any symptoms of PKU.

Make a single pedigree chart using the above information to show the pattern of inheritance of phenylketonuria (PKU) in the family of Reshma.

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Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

What are introns?

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

Transcription is the transfer of genetic code from a DNA molecule to:
(i) RNA molecule
(ii) Second DNA molecule
(iii) Ribosomal sub unit·
(iv) Sequence of amino acids in a protein molecule

Appears in 1 question paper
Chapter: [6] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Initiation codon of protein synthesis in Eukaryotes is ______.

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

Give one significant contribution to the following scientists:

Sanger

Appears in 1 question paper
Chapter: [6] Molecular Basis of Inheritance
Concept: Human Genome Project

What is the central dogma?

Appears in 1 question paper
Chapter: [6] Molecular Basis of Inheritance
Concept: Protein Synthesis >> Transcription

Explain the mechanism of transcription in a prokaryotic cell.

Appears in 1 question paper
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.

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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. 

Appears in 1 question paper
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
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