Sex-linked traits are special characteristics that come from genes found on our sex chromosomes. In humans, these chromosomes are mainly the X chromosome. Here are some common examples:

1. Color Blindness:

   • About 8% of boys and only 0.5% of girls struggle with color vision problems because of a change in the X chromosome.

2. Hemophilia:

   • This is a blood condition that makes it hard for blood to clot. It affects about 1 in 5,000 boys but is much less common in girls, with about 1 in 30,000 being affected.

3. Muscular Dystrophy:

   • One serious type, called Duchenne Muscular Dystrophy, occurs in about 1 in 3,500 boys. This condition leads to muscle weakness as time goes on.

These traits are passed down in a special way. Males are more likely to be affected by these traits because they have only one X chromosome (XY), while females have two (XX). This means that girls might have a backup gene that can cover for the one that doesn’t work properly.