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Explain the sex-determination mechanism ...

Explain the sex-determination mechanism in humans. How is it different in birds?

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Sex determination in humans-XY type. Out of 23 pairs, 22 pairs are exactly same in males and females (autosomes) 23rd pair is X-chromosomes in female and X, Y in males
Sex determination in birds. They have ZZ-ZW type of sex determination, i.e., females have ZW pair in addition to autosomes whereas males have ZZ sex chromosomes in addition to antosomes. They show female heterogamety i.e., .ZW in females and males are homogametic ZZ. So sex is determined by female which produces two dissimilar gametes with .Z. or .W chromosomes.
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Knowledge Check

  • Foetal sex determination test is known as

    A
    sterilisation
    B
    barrier method
    C
    Amniocentesis
    D
    Coitus interruptus

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