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Q.Write a short note on XX-XY system of sex determination.

Uttar Pradesh UpmspUP Board (UPMSP) Intermediate 2018Subjective· 1mImportance★★★★★
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XX-XY: females XX (homogametic), males XY (heterogametic) — the male's sperm determines sex.

In the XX-XY type of sex determination (found in humans, Drosophila and many mammals):

  • The female has two similar sex chromosomes, XX. She is homogametic and forms only one type of egg carrying an X chromosome.
  • The male has two different sex chromosomes, XY. He is heterogametic and forms two types of sperm — 50% carrying X and 50% carrying Y. …

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