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ISC (Science) ISC Class 12 - CISCE Important Questions

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Sapna has been diagnosed with an infection of the reproductive tract caused by bacteria. She experiences burning sensation during urination, pain around her genitalia and observes pus containing discharge. Her doctor tells her that this infection has an incubation period of two to five days but can be cured.

What is the biological name of the causative agent of the disease Sapna is suffering from?

Appears in 1 question paper
Chapter: [4] Reproductive Health
Concept: Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)

Which is the most commonly prescribed non-steroidal oral contraceptive pill in India?

Appears in 1 question paper
Chapter: [4] Reproductive Health
Concept: Concept of Reproductive Health

Which one of the following choices reflects the correct number of chromosomes in the zygote and in the second polar body of Drosophila melanogaster?

  Zygote Meiocytes
I 08 08
II 04 08
III 08 04
IV 04 04
Appears in 1 question paper
Chapter: [4] Reproductive Health
Concept: Infertility

All STDs do not affect the genital organs. Justify the statement.

Appears in 1 question paper
Chapter: [4] Reproductive Health
Concept: Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)

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

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Human Genetic Disorders

Choose the correct options of the following question:

Study the given monohybrid cross:

A test cross for this Fj will be:

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

Define the Homologous chromosomes

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

A homozygous pea plant with round seed coat and yellow cotyledons are crossed with another homozygous, pea plant having wrinkled seed coat and green cotyledons.

  1. Give the types of gametes produced by plants of F-generation.
  2. Give the dihybrid phenotypic ratio with the corresponding phenotypes.
  3. State Mendel’s principle involved in this cross.
Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Heredity and Variation

Mention one cause for variation in nature.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Heredity and Variation

Explain the process of sex determination in honey bees.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Sex Determination >> Sex Determination in Honey Bees

Give an account of artificial chromosomes in the transfer of genetic material.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

What is the genotype of Turner's Syndrome?

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Human Genetic Disorders

Mention any one symptom of Turner's syndrome.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Human Genetic Disorders

A haemophilic man marries a carrier woman and they have a daughter. What is the probability of their daughter being haemophilic?

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

In a karyotype analysis, X and Y chromosomes represent sex chromosomes.

Name the scientist who discovered the X chromosome.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

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.
Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Human Genetic Disorders

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.

Appears in 1 question paper
Chapter: [5] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

What are introns?

Appears in 1 question paper
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 ______.

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