Dominant Genes:

* Definition: A dominant gene is a gene that expresses its trait even when only one copy of that gene is present.

* How it works: Think of it like a "stronger" gene. If you have one dominant gene for a particular trait, that trait will show up.

* Example: Brown eyes are dominant over blue eyes. If you inherit one gene for brown eyes and one for blue eyes, you will have brown eyes.

Recessive Genes:

* Definition: A recessive gene only expresses its trait if two copies of the gene are present.

* How it works: Think of it like a "weaker" gene. If you only have one copy of a recessive gene, its trait won't be visible. You'll only see the trait if you have two copies of the recessive gene.

* Example: Blue eyes are recessive. You'll only have blue eyes if you inherit two copies of the gene for blue eyes (one from each parent).

Visual Analogy:

Imagine you have two light switches. One switch represents a dominant gene, and the other represents a recessive gene.

* Dominant: If you flip the dominant switch (one copy of the gene), the light will turn on (the trait will be expressed).

* Recessive: To turn on the light using the recessive switch (two copies of the gene), you need to flip both switches.

Key Points:

* Pairs: Genes come in pairs, one from each parent.

* Homozygous: If you have two copies of the same gene (e.g., two copies of the brown eye gene), you are homozygous for that trait.

* Heterozygous: If you have two different copies of the gene (e.g., one brown eye gene and one blue eye gene), you are heterozygous for that trait.

Important Note: This is a simplified explanation of dominant and recessive genes. The reality is more complex, with many factors affecting how genes are expressed.