Sex determination is one of biology's most fascinating processes. In humans, biological sex is determined by a pair of special chromosomes called sex chromosomes. This incredible system ensures roughly equal numbers of males and females in the population through a precise genetic mechanism.
đŦ Key Concepts
Sex chromosomes determine biological sex
Human males are XY, females are XX
Equal probability for male and female offspring
Different mechanisms exist across species
Amazing Fact!
The Y chromosome is the smallest human chromosome with only about 58 million DNA building blocks, while the X chromosome has about 155 million!
đ¯ Learning Objectives
Understand how chromosomes determine sex, explore the inheritance patterns, and discover how this system evolved across different species.