Class 9 | Heredity and Variation

By Shubham Jha / February 18, 2024

If one parent is normal and one parent is carrier of sickle-cell anaemia, then the progenies will be

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What is heredity?

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What is genetic variation?

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What is a mutation?

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What is variation?

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The double helix model of DNA was produced by

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…........ is a recessive character in human beings.

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What is genetic variation?

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Sex chromosomes are called …..........

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The chromosome in which the centromere is near one end of the chromosome is called ….... chromosome.

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….... is a mitochondrial disorder.

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Which of the following is absent in RNA?

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….......... arises due to either inheritance of only X chromosome from parents or due to inactivation of the gender-related part of X-chromosomes.

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Progenies of normal man and sufferer woman for sickle-cell anaemia will be …..........

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In a monohybrid cross, the phenotypic ratio of F2 generation is

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What is a chromosome?

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…........ is a monogenic disorder

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What is DNA?

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What are dominant traits?

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DNA was discovered by

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The molecule of RNA which is a component of the ribosome organelle is called a

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What is sexual reproduction?

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What is phenotype?

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What are recessive traits?

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If one parent is carrier and one parent is a sufferer of sickle-cell anaemia, then the progenies will be

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What is a gene?

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….. is a recessive character of pea plant

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What is genotype?

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…........ is a dominant character of pea plant.

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…........ is a dominant character in human beings

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Heredity and variation

Class 9 | Science | Heredity and Variation

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What is genetic variation?

The diversity of alleles and genes within a population or species.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is a mutation?

A change in the DNA sequence of a gene or chromosome.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is sexual reproduction?

A type of reproduction that involves the fusion of gametes from two parents, resulting in offspring that inherit traits from both parents.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is genetic variation?

The diversity of alleles and genes within a population or species.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is phenotype?

The physical or observable characteristics of an individual, resulting from the interaction of its genotype with the environment.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is genotype?

The genetic makeup of an individual, including the combination of alleles for a given trait.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What are recessive traits?

Traits that are expressed only when two copies of the gene are present in an individual's genotype.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What are dominant traits?

Traits that are expressed when only one copy of the gene is present in an individual's genotype.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is a chromosome?

A thread-like structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is DNA?

Deoxyribonucleic acid, a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is a gene?

A segment of DNA that carries genetic information and determines a specific trait.

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

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What is variation?

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

The differences in physical or mental characteristics among individuals of the same species.

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What is heredity?

The passing on of physical or mental characteristics genetically from one generation to another.

The process of producing offspring that are genetically identical to the parent organism.

The transmission of traits from parents to their offspring through sexual reproduction.

The combination of genetic material from two parent organisms.

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……….. is a monogenic disorder

Haemophilia

Cleft palate

Diabetes

Spina bifida

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……. is a mitochondrial disorder.

Down syndrome

Cleft palate

Spina bifida

Leber hereditary optic neuropathy

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If one parent is carrier and one parent is a sufferer of sickle-cell anaemia, then the progenies will be

50% normal and 50% carrier

all sufferers

50% carrier and 50% sufferer

all carrier

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If one parent is normal and one parent is carrier of sickle-cell anaemia, then the progenies will be

all normal

50% normal and 50% carrier

50% carrier and 50% sufferer

all carrier

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Progenies of normal man and sufferer woman for sickle-cell anaemia will be ………….

all normal

25% normal and 75% sufferer

all carrier

all sufferer

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…………. arises due to either inheritance of only X chromosome from parents or due to inactivation of the gender-related part of X-chromosomes.

Down syndrome

Turner syndrome

Klinefelter syndrome

Albinism

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In a monohybrid cross, the phenotypic ratio of F2 generation is

1 tall : 3 dwarf

2 tall : 2 dwarf

3 tall : 1 dwarf

3 tall : 2 dwarf

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……….. is a recessive character in human beings.

Absence of hair on arms

Black and curly hair

Free earlobe

Presence of hair on arms

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……….. is a dominant character in human beings

Non-rolling tongue

Attached ear lobe

Absence of hair on arms

Free ear lobe

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……….. is a dominant character of pea plant.

Dwarf height

Yellow colour of pod

Yellow colour of seeds

Terminal position of flower

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….. is a recessive character of pea plant

Round shape of seeds

White colour of flowers

Green colour of pods

Inflated shape of pods

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The molecule of RNA which is a component of the ribosome organelle is called a

mRNA

tRNA

rRNA

DNA

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The double helix model of DNA was produced by

Watson and Crick

Frederick Miescher

Gregor Johann Mendel

Robert Brown

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DNA was discovered by

Watson and Crick

Frederick Miescher

Gregor Johann Mendel

Robert Brown

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Which of the following is absent in RNA?

Adenine

Uracil

Cytosine

Thymine

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Sex chromosomes are called ………….

homologous chromosomes

autosomes

allosomes

metacentric chromosomes

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The chromosome in which the centromere is near one end of the chromosome is called ……. chromosome.

metacentric

acrocentric

sub-metacentric

telocentric

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