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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</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</p> Signup and view all the answers

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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Description

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.