Gentics Basis Of Inheritance

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| By Rishi Bhandarkar
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Rishi Bhandarkar
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Gentics Basis Of Inheritance - Quiz


First Chapter Of MHstate board HSC book.


Questions and Answers
  • 1. 

    When the term genetics Discovered by wiilam bateson?

    • A.

      1904

    • B.

      1908

    • C.

      1902

    • D.

      1906

    Correct Answer
    D. 1906
    Explanation
    In 1906, the term genetics was discovered by William Bateson. This was a significant milestone in the field of biology as it marked the formal recognition and naming of the study of heredity and variation in organisms. Bateson's work and the introduction of the term genetics paved the way for further advancements in understanding how traits are passed down from one generation to another and the role of genes in determining these traits.

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  • 2. 

    When two organisms are crossed, the offspring are referred to as?

    • A.

      The F2 generation.

    • B.

      Recessive.

    • C.

      The F1 generation.

    • D.

      A genotype.

    Correct Answer
    C. The F1 generation.
    Explanation
    When two organisms are crossed, the offspring are referred to as the F1 generation. This term is used to describe the first generation of offspring resulting from the cross between two parent organisms. The F1 generation inherits traits from both parent organisms and serves as the starting point for further genetic studies and experiments.

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  • 3. 

    A chart used to determine the offspring of a genetic cross is called a

    • A.

      Cross chart

    • B.

      Back cross chart

    • C.

      Punnet square 

    • D.

      Genetic Square

    Correct Answer
    C. Punnet square 
    Explanation
    A Punnett square is a chart used to determine the possible combinations of alleles that can result from a genetic cross. It is named after Reginald Punnett, who developed this method in the early 20th century. The Punnett square helps to predict the probability of certain traits being inherited by offspring based on the genotypes of the parents. It is a valuable tool in genetics to understand inheritance patterns and make predictions about the offspring's traits.

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  • 4. 

    What does GENOTYPE refer to?

    • A.

      The chromosomes of an organism

    • B.

      The genetic make-up of an organism

    • C.

      The type of gene in question

    • D.

      The physical expression of gene

    Correct Answer
    B. The genetic make-up of an organism
    Explanation
    Genotype refers to the genetic make-up of an organism. It represents the specific combination of genes that an organism possesses, which determines its inherited traits and characteristics. The genotype is responsible for the potential range of physical expression of these genes, but it is not the physical expression itself. The chromosomes of an organism contain the genetic material that makes up the genotype, but the genotype refers to the specific genetic information and not the physical structures. The type of gene in question is not the same as the genotype, as the genotype encompasses all the genes in an organism's genome.

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  • 5. 

    Number of Genotype in dihybrid ratio ?

    • A.

      9

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    A. 9
    Explanation
    The number of genotypes in a dihybrid ratio is 9. In a dihybrid cross, two traits are being considered, each with two possible alleles. When these traits are crossed, they can give rise to 9 different genotypes: AABB, AABb, AAbb, AaBB, AaBb, Aabb, aaBB, aaBb, and aabb. Each genotype represents a different combination of alleles for the two traits being studied.

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  • 6. 

    Antirrhinum majus is an example of 

    • A.

      Co-dominanace  

    • B.

      Law of assortment

    • C.

      Law of dominance

    • D.

      Incomplete dominance

    Correct Answer
    D. Incomplete dominance
    Explanation
    Antirrhinum majus is an example of incomplete dominance because it exhibits a blending of traits from both alleles in the heterozygous condition. In this case, neither allele is completely dominant over the other, resulting in an intermediate phenotype that is a combination of both alleles.

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  • 7. 

    A gene which causes death of the barrier is called 

    • A.

      Complementry gene

    • B.

      Substitution gene

    • C.

      Inversion gene  

    • D.

      Lethal gene

    Correct Answer
    D. Lethal gene
    Explanation
    A gene that causes death of the organism or an essential part of it is called a lethal gene. This gene can lead to the death of an individual during development or at any stage of life. It can be inherited and passed on to future generations, causing a decrease in the overall fitness of a population. Lethal genes are important in genetic studies and can provide insights into the functioning of certain biological processes.

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  • 8. 

    Which gene controls the ABO blood group,            .

    Correct Answer
    I
  • 9. 

    Marriage between white and black colour  and in  F1 genneration show skin colour is

    • A.

      Black

    • B.

      Nigro

    • C.

      Malenin

    • D.

      Mullatoes

    Correct Answer
    D. Mullatoes
    Explanation
    In the F1 generation, when a marriage occurs between white and black colors, the resulting offspring will have a mixed skin color known as "Mulattoes." Mulattoes typically have a combination of traits from both white and black individuals, resulting in a unique skin color.

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  • 10. 

    When the Gregor Johann Mendel start the experiment on pea plant

    • A.

      1855

    • B.

      1856

    • C.

      1864

    • D.

      1865

    Correct Answer
    B. 1856
  • 11. 

    Why Mendel select pea plant for his experiments

    • A.

      They are bisexual

    • B.

      They have short life span

    • C.

      Both A and B

    • D.

      Only A

    Correct Answer
    C. Both A and B
    Explanation
    Mendel selected pea plants for his experiments because they have both male and female reproductive organs (bisexual), allowing for easy cross-pollination and controlled breeding. Additionally, pea plants have a short life span, allowing for multiple generations to be observed within a relatively short period of time. Therefore, both factors, the bisexuality and short life span of pea plants, made them ideal for Mendel's experiments on inheritance.

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  • 12. 

    Exceptions to Law of Dominanace is Incomplete dominance and co-dominance

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The statement is true because incomplete dominance and co-dominance are indeed exceptions to the law of dominance. Incomplete dominance occurs when the heterozygous phenotype is a blend of the two homozygous phenotypes, rather than one dominating over the other. Co-dominance, on the other hand, occurs when both alleles are expressed equally in the heterozygous phenotype. These exceptions challenge the traditional notion that one allele will always dominate over another in determining the phenotype.

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  • 13. 

    Genetics is?

    • A.

      Study of heredity and inheritance

    • B.

      Study of heredity and variation

    • C.

      Study of variation and inheritance

    • D.

      Study of process of heredity

    Correct Answer
    B. Study of heredity and variation
    Explanation
    Genetics is the study of heredity, which refers to the passing down of traits from parents to offspring. It also involves the study of variation, which refers to the differences in traits among individuals of the same species. Therefore, the correct answer is "study of heredity and variation." This field of science explores how genes are inherited and how they contribute to the diversity and variation within a population.

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  • 14. 

    Which  term was coined by johannsen?

    • A.

      Allele

    • B.

      Factor

    • C.

      Gene

    • D.

      Both A and B

    Correct Answer
    C. Gene
    Explanation
    Johannsen coined the term "gene".

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  • 15. 

    What is the phenotypic ratio & number of genotype in incomplete dominance

    • A.

      3:1 & 3 respectivily

    • B.

      3:1 & 2 respectivily

    • C.

      1:2:1: & 2 respectevely

    • D.

      1:2:1: & 3 respectevely

    Correct Answer
    D. 1:2:1: & 3 respectevely
    Explanation
    In incomplete dominance, the phenotypic ratio is 1:2:1, which means that there is an equal chance of three different phenotypes appearing in the offspring. The number of genotypes is 3, which corresponds to the three possible combinations of alleles that can result in the observed phenotypes.

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  • 16. 

    Who is theFather of Genetics?

    • A.

      G.J. Mendel

    • B.

      William Batesson

    • C.

      Johannson

    • D.

      A.V. Leuwenhoek

    Correct Answer
    A. G.J. Mendel
    Explanation
    G.J. Mendel is considered the Father of Genetics because he is the scientist who laid the foundation for the study of inheritance and heredity. Through his experiments with pea plants, Mendel discovered the basic principles of genetics, including the laws of segregation and independent assortment. His work established the concept of genes and their role in determining traits, which revolutionized the understanding of how traits are passed on from one generation to the next. Mendel's discoveries formed the basis for modern genetics and his contributions are widely recognized in the field.

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  • 17. 

    What is the Genotypic ratio of dihybrid Cross

    • A.

      1:2:1:2:1:4:1:2:1

    • B.

      1:2:4:2:1:2:1:2:1

    • C.

      1:2:2:4:1:2:1:2:1

    • D.

      Above all are incorrect

    Correct Answer
    C. 1:2:2:4:1:2:1:2:1
    Explanation
    The genotypic ratio of a dihybrid cross refers to the ratio of different genotypes that can result from the cross. In this case, the correct answer is 1:2:2:4:1:2:1:2:1. This means that for every possible genotype combination, the ratio is as follows: 1 homozygous dominant for both traits, 2 heterozygous for both traits, 2 heterozygous for one trait and homozygous recessive for the other trait, 4 heterozygous for one trait and homozygous dominant for the other trait, 1 homozygous recessive for both traits, 2 heterozygous for one trait and homozygous recessive for the other trait, 1 homozygous recessive for one trait and heterozygous for the other trait, 2 heterozygous for both traits, 1 homozygous dominant for one trait and heterozygous for the other trait.

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  • 18. 

    What is phenotypic ratio when two genes cross in case of Quantitative inheritance

    • A.

      3:3:3:1

    • B.

      3:1

    • C.

      1:2:1

    • D.

      1:4:6:4:1

    Correct Answer
    D. 1:4:6:4:1
    Explanation
    The phenotypic ratio of 1:4:6:4:1 suggests that there are five possible phenotypes resulting from the cross between two genes in quantitative inheritance. This ratio indicates that the most common phenotype is represented by the middle value (6), while the two extreme phenotypes have the lowest and highest values (1). The other two phenotypes have intermediate values (4). This ratio suggests that the expression of the traits controlled by these genes follows a continuous distribution, with the majority of individuals falling within the middle range of phenotypes.

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  • 19. 

    Alternative form of gene is known as

    • A.

      Trait

    • B.

      Factor

    • C.

      Allele

    • D.

      Both B & C

    Correct Answer
    D. Both B & C
    Explanation
    The alternative form of a gene is known as an allele. Alleles are different versions of a gene that can produce different traits. In this case, the answer is both B (Trait) and C (Allele) because traits are determined by the combination of alleles.

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  • 20. 

    How much Characterare selected by mendel on his experimnt of pea plant

    • A.

      14

    • B.

      12

    • C.

      7

    • D.

      9

    Correct Answer
    C. 7
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