* Dominant Alleles: A dominant allele is one that masks the effect of a recessive allele when both are present.
* Inheritance: Each parent contributes one allele for a trait to their offspring.
* F1 Generation: If one parent has a dominant allele for a trait, there is a high chance that the offspring will inherit that dominant allele and express the associated trait.
Example:
* Trait: Brown eyes (dominant) vs. blue eyes (recessive)
* Parents: One parent has brown eyes (BB or Bb) and the other has blue eyes (bb).
* F1 Generation: All offspring will have brown eyes (Bb), even though they inherit a recessive allele (b) from the blue-eyed parent. The dominant 'B' allele masks the recessive 'b' allele.
Important Note: While a dominant trait is likely to appear in the F1 generation, it's not guaranteed. It depends on the specific alleles each parent carries.