Dominant Traits:
* Definition: A dominant trait is one that is expressed even if only one copy of the gene is present.
* Expression: If an offspring inherits at least one copy of the dominant gene, they will express the dominant trait.
* Example: Brown eyes are dominant over blue eyes. If a parent has brown eyes (BB or Bb) and the other parent has blue eyes (bb), their offspring will most likely have brown eyes (Bb).
Recessive Traits:
* Definition: A recessive trait is only expressed if two copies of the gene are present.
* Expression: An offspring will only express a recessive trait if they inherit two copies of the recessive gene.
* Example: Blue eyes are recessive. For an offspring to have blue eyes, they need to inherit the "b" gene from both parents (bb).
Other Factors:
* Incomplete dominance: Some traits exhibit incomplete dominance, meaning that the heterozygous phenotype is a blend of the two homozygous phenotypes.
* Codominance: In codominance, both alleles are expressed equally in the heterozygous phenotype.
* Sex-linked traits: Some traits are linked to the sex chromosomes (X or Y), which can influence their inheritance pattern.
In summary:
* Dominant traits are usually expressed in offspring.
* Recessive traits are only expressed if two copies of the recessive gene are inherited.
It's important to remember that these are general principles, and there are exceptions to every rule. The specific inheritance pattern of a trait depends on the genes involved and their interactions.
