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Sex chromosomes and who decides the sex

This type of question, asked 3 times: 2023, 2024, 2026. All 8 questions below, oldest first.

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  1. Question 1

    2023

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    18
    Assertion (A) : Genes inherited from the parents decide the sex of a child. Reason (R) : X chromosome in a male child is inherited from his father.

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  2. Question 2

    2023

    10
    Which pair of sex chromosome will determine a male ?

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  3. Question 3

    2024

    8
    Consider the following statements : (i) The sex of a child is determined by what it inherits from the mother. (ii) The sex of a child is determined by what it inherits from the father. (iii) The probability of having a male child is more than that of a female child. (iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote. The correct statements are :

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  4. Question 4

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    18
    Assertion (A) : Sex of the children will be determined by what they inherit from their mother. Reason (R) : Women have XX sex chromosomes.

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  5. Question 5

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    19
    Assertion (A) : In human beings, males have ‘XX’ sex chromosomes and females have ‘XY’ sex chromosomes. Reason (R) : Sex of the child is determined at the time of fertilisation when male and female gamete fuse to form a zygote.

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  6. Question 6

    2024

    Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
    18
    Assertion (A) : Human female has a perfect pair of sex chromosome. Reason (R) : Sex chromosome contributed by the human male in the zygote decides the sex of a child.

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  7. Question 7

    2026

    6
    Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ? (i) Gamete carrying X chromosome from female parent. (ii) Gamete carrying X chromosome from male parent. (iii) Gamete carrying Y chromosome from male parent.

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  8. Question 8

    2026

    13
    (a) A couple are parents to 4 daughters in a sequence, and do not have any son. Does this indicate that the husband does not produced Y-chromosome bearing sperms ? Explain. (b) What are the chances of this couple bearing yet another daughter ? Show with the help of a cross.