5 Questions
What triggers male development in humans in the XY sex-determination system?
Presence of the Y chromosome
In the XY sex-determination system, what sex is the homogametic sex?
Female
What syndrome involves individuals with XXY chromosomes?
Klinefelter syndrome
What is the genetic makeup of a seemingly normal female with XY chromosomes but the SRY gene has been shut down?
XX
What must an organism have in order to survive in most species with XY sex determination?
At least one X chromosome
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.
Test your knowledge of the XY sex-determination system used by mammals, insects, snakes, fish, and plants to determine the sex of an individual based on their sex chromosomes. Learn about the characteristics of homogametic and heterogametic sexes in this system.
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