Sex-linked traits are really interesting because they involve genes that are found on the sex chromosomes. Those are the X and Y chromosomes. Let’s break it down:

1. Where Genes Live:

   • Most traits, like eye color, are on regular chromosomes called autosomes.
   • Sex-linked traits are on either the X or Y chromosome.

2. How They Show Up in Boys and Girls:

   • Boys have one X and one Y chromosome (XY). This means if they get a recessive trait from their mom on the X chromosome, it will show up.
   • For example, color blindness happens more in boys because they only need one affected X chromosome to have it.
   • Girls have two X chromosomes (XX). They need two copies of a recessive gene to show the trait. That’s why conditions like hemophilia are less common in girls.

3. How Traits Are Passed Down:

   • Sex-linked traits don’t follow the usual patterns we see with dominant and recessive traits.
   • Instead, the way these traits are passed down can look different, often affecting boys more than girls.

In summary, sex-linked traits are all about how chromosomes play a special role in passing down traits. This makes studying genetics an even more exciting adventure!