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SEX DETERMINATION IN HUMANS...

SEX DETERMINATION IN HUMANS

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(i) In human being, the chromosomal mechanism of sex-determination is of XX-XY type. In human the nucleus of each cell contains 46 chromosomes or 23 pairs of chromosomes of body characters and 1 pair is of sex chromosomes (responsible for determination of sex).
1. In female, two homomorphic sex chromosomes are XX.
2. In male, two heteromorphic sex chromosomes are XY.
3. The genotypes of female and male is : Female : 46 Chromosomes = 44 Autosomes + XX sex chromosomes Male : 46 Chromosomes = 44 Autosomes + XY sex chromosomes
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Knowledge Check

  • Assertion: In humans, sex chromosomes determine the sex and various sex linked characteristic. Reason: In humans, female sex chromosomes are XY while in males, sex chromosomes are XX.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

  • Assertion : Females not participate in the determination of the sex of baby . Reason : Human male is heterogametic .

    A
    If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
    B
    If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is True but the Reason is False .
    D
    If both Assertion & Reason are False.

  • Consider the following statements: Assertion (A): In humans, female sex is determined by XX-chromosomes. Reason (R): Male sex is determined by YY-chromosomes.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true, but R is not the correct explanation of A.
    C
    A is true, but R is false
    D
    A is false, but R is true.

    • Similar Questions

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    Sex Determination A. Environmental Determination OF Sex B. Non Allosomic Genic Determination OF Sex C. Chromosomal Determination OF Sex (XY-Method ZW-Method Xo-Method ZO-Method)

    Assertion In human, female sex is determined by XX chromosome Reason Male sex is determined by XY-chromosome

    What is sex-determination?Explain XX and XY type of sex determination.

    (a) In humans, males are heterogametic and frmales are homogametic, Explain. Are there any examples where males are homogametic and females heterogametic? (b) Also describe as to, who determines the sex of an unborn child? Mention whether temperature has a role in sex determination.

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