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

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

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(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.

GURUKUL PUBLICATION - MAHARASHTRA PREVIOUS YEAR PAPERS- MARCH 2016-SECTION-II
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