Dominant Traits:
* Definition: A dominant trait is a characteristic that appears in an offspring even if only one copy of the associated gene is inherited from a parent.
* How it works: A dominant gene (represented by a capital letter, like "B") masks the expression of the recessive gene (represented by a lowercase letter, like "b").
* Example: Brown eyes are dominant over blue eyes. If a person inherits one gene for brown eyes (B) and one gene for blue eyes (b), they will have brown eyes.
Recessive Traits:
* Definition: A recessive trait only appears in an offspring if both copies of the associated gene are inherited from the parents.
* How it works: A recessive gene will only be expressed if two copies of the recessive allele are present (e.g., "bb").
* Example: Blue eyes are recessive. To have blue eyes, you must inherit two copies of the blue eye gene (bb). If you inherit even one copy of the brown eye gene (B), you'll have brown eyes.
Key Points:
* Alleles: Genes come in different forms called alleles. Each person inherits two alleles for each gene, one from each parent.
* Genotype: The genetic makeup of an organism (e.g., Bb, BB, bb).
* Phenotype: The physical expression of a trait (e.g., brown eyes, blue eyes).
Simplified Analogy:
Imagine a dominant trait like a "loud" gene that always makes its presence known. A recessive trait is like a "quiet" gene that only shows up if it has a partner.
Important Note: Many traits are more complex than simple dominance and recessiveness. Some traits are influenced by multiple genes, environmental factors, or a combination of both.
