Heredity Chapter 8 Class 10 Science PYQs


Practice PYQ of Heredity Chapter 8 Class 10 Science with handpicked important questions from previous years question paper with solutions.


    Q1:

    Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in F1 generation. (a) What is the gene combination present in the plants of F1generation ? (b) Give reason why only tall plants are observed in F1 progeny. (c) What will be the ratio of the plants obtained in the F2 generation when F1 plants are self-pollinated ?

    CBSE [2023]

    Easy

    Q2:

    Mendel crossed two pea plants with visible contrasting characteristics and found that there were no half-way characteristics in the plants of F1 progeny. Explain the reason for this observation of Mendel.

    CBSE [2022]

    Easy

    Q3:

    The mechanism by which the sex of an individual is determined is called sex-determination. In human beings, sex of a newborn is genetically determined, whereas in some others it is not. There are 46 (23 pairs) chromosomes in human beings. Out of these, 44 (22 pairs) control the body characters and 2 (one pair) are known as sex chromosomes. The sex chromosomes are of two types X chromosome and Y chromosome. At the time of fertilisation, depending upon which type of male gamete fuses with the female gamete, the sex of the newborn child is decided. (a) Why is a pair of sex chromosomes in human beings called a mismatched pair in terms of type and size ? (b) Out of male or female, which of them has a perfect pair of sex chromosomes ? In case of a perfect pair, will the gametes produced be of the same kind or of a different kind ? (c) (i) Name two animals whose sex is not genetically determined. Explain the process of their sex determination.

    CBSE [2022]

    Medium

    Q4:

    (i) In a cross between violet flowered plants and white flowered plants, state the characteristics of the plants obtained in the F1 progeny. (ii) If the plants of F1 progeny are self-pollinated, then what would be observed in the plants of F2 progeny ? (iii) If 100 plants are produced in F2 progeny, then how many plants will show the recessive trait ?

    CBSE [2022]

    Medium

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