XY Sex Determination System

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Questions and Answers

What triggers male development in humans in the XY sex-determination system?

  • Presence of the Y chromosome (correct)
  • Presence of two X chromosomes
  • Absence of the Y chromosome
  • Absence of both X and Y chromosomes

In the XY sex-determination system, what sex is the homogametic sex?

  • Male
  • Intersex
  • Female (correct)
  • Non-binary

What syndrome involves individuals with XXY chromosomes?

  • Klinefelter syndrome (correct)
  • Down syndrome
  • Turner syndrome
  • Swyer syndrome

What is the genetic makeup of a seemingly normal female with XY chromosomes but the SRY gene has been shut down?

<p>XX (B)</p> Signup and view all the answers

What must an organism have in order to survive in most species with XY sex determination?

<p>At least one X chromosome (C)</p> Signup and view all the answers

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Study Notes

Sex Determination in Humans

  • The SRY gene on the Y chromosome triggers male development in humans in the XY sex-determination system.

Sex Determination in the XY System

  • The XX chromosomes determine the homogametic sex (female) in the XY sex-determination system.

Klinefelter Syndrome

  • Klinefelter syndrome involves individuals with XXY chromosomes, a genetic condition where males have an extra X chromosome.

Genetic Makeup of a Seemingly Normal Female

  • A seemingly normal female with XY chromosomes but the SRY gene has been shut down is a rare occurrence, where the individual lacks the trigger for male development.

Survival in XY Sex Determination

  • To survive in most species with XY sex determination, an organism must have a functional SRY gene or a compatible genetic makeup to trigger male development.

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