Here's how it works:
* Alleles: These are alternative forms of a gene. For example, a gene for eye color might have an allele for blue eyes and an allele for brown eyes.
* Dominant: A dominant allele exerts its effect even when paired with a different allele.
* Recessive: A recessive allele only exerts its effect when paired with another copy of the same recessive allele.
Example:
Let's say brown eyes are dominant (B) and blue eyes are recessive (b). Here are the possible combinations:
* BB: Brown eyes (both alleles are dominant)
* Bb: Brown eyes (the dominant brown allele masks the recessive blue allele)
* bb: Blue eyes (both alleles are recessive)
In this example, the brown eye allele (B) is dominant because it masks the effect of the blue eye allele (b). You only get blue eyes if you have two copies of the recessive blue eye allele (bb).
