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    Wa0001.

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    Wa0001.

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    Original Title

    DOC-20240415-WA0001.

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    9 views2 pages

    Wa0001.

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    shanthidesai8

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    © All Rights Reserved
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    of 2

    LAKSHMI SCHOOL

    CLASS: X - BIOLOGY WORKSHEET - 3

    GENETICS
    (a) Choose the best option.
    (i) Who is known as the “Father of Genetics”?
    1. Morgan
    2. Mendel
    3. Watson
    4. Bateson

    (ii) The tendency of an offspring to resemble its parent is known as


    1. Variation
    2. Heredity
    3. Resemblance
    4. Inheritance

    (iii) The genotypic ratio of a monohybrid cross is


    1. 1:2:1
    2. 3:1
    3. 2:1:1
    4. 9:3:3:1

    (iv) If a pure tall plant is crossed with a pure dwarf plant, then offspring will be
    1. All tall
    2. All dwarfs
    3. 3 tall 1 dwarf
    4. 50% tall 50% dwarf

    (v) The geometrical device that helps to find out all the possible combinations of male
    and female gametes is known as
    1. Bateson Square
    2. Mendel Square
    3. Punnett Square
    4. Mendel’s Cube

    (b) Differentiate between the following.


    (i) Genotype and Phenotype
    (ii) Character and Trait
    (iii) Homozygous condition and Heterozygous condition
    (iv) Monohybrid and Dihybrid cross (phenotypic ratio).

    1
    (C) Match the following.
    Match the terms in column I with their the explanations in column II
    Column I Column II
    (Term) (Explanation)
    a Genetics (i) Chromosomes similar in size
    and shape
    b Autosomes (ii) The alternative forms of a
    gene
    c Recessive gene (iii) Study of laws of inheritance
    of characters
    d Allele (iv) A gene that can express
    when only in a similar pair
    e Homologous (v) Chromosomes other than the
    chromosomes pair of sex chromosomes

    (d) Answer the following questions:

    (i) A family consists of two parents and their five children and the pedigree chart shown
    below shows the inheritance of the trait colour blindness in them.

    (a) Who is colour blind in the parents - the Father or the Mother?
    (b) How many daughters and how many sons have been born in the family?
    (c) What does the child 1 indicate about this trait?
    (d) On which chromosome is the gene of this trait located?
    (e) Name one other trait in humans which follows a similar pattern of inheritance.

    (ii) Does the sex of the child depend on the father or is it just a matter of chance?
    Discuss.

    (iii) State the three Mendel's laws of inheritance.

    (iv) Explain why generally only the male child suffers from colour blindness and not the
    female?

    (v) List any three features of garden pea with their dominant and recessive traits.

    --------------------------------------------------------------------------------------------------------------------

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