A person with a YY chromosome is male and has a condition called XYY syndrome. This is a genetic condition that occurs when a male receives an extra Y chromosome during fertilization. While most males have an XY chromosome, males with XYY syndrome have an extra Y chromosome, or XYY.
Note: There is no known occurrence of a person with only a YY chromosome. To be born, a person needs at least one X chromosome, which carries essential genetic information.
The extra Y chromosome in XYY syndrome doesn't significantly impact physical appearance. However, it can lead to some physical and developmental differences, including increased height, learning disabilities, and behavioral issues.
References:
- XYY Syndrome (for Parents) | Nemours KidsHealth: https://kidshealth.org/en/parents/xyy-syndrome.html
- What Are YY Chromosomes? When Superman Syndrome Occurs: https://www.webmd.com/a-to-z-guides/what-are-yy-chromosomes
- XYY Syndrome: Causes, Symptoms, and More: https://www.healthline.com/health/xyy-syndrome
- Is there a YY gender?: https://byjus.com/question-answer/is-there-a-yy-gender/
