Dominant vs Recessive Alleles

Introduction

• Alleles: Variants of genes; organisms have at least two alleles per gene.
• Traits examples: Eye color, horn size, etc.

Dominant and Recessive Relationships

• Dominant allele: Expressed over the other allele.
• Recessive allele: Not expressed when a dominant allele is present.
• Representation:
  • Uppercase letters for dominant alleles.
  • Lowercase letters for recessive alleles.

Example: Cat Fur Color

• Fur colors: Orange (dominant) and Gray (recessive).
• Letter chosen for fur color: F
  • Capital F (F): Represents dominant (Orange fur).
  • Lowercase f (f): Represents recessive (Gray fur).

Possible Allele Combinations

1. Two Dominant Alleles
   • FF: Fur color is orange.
2. Two Recessive Alleles
   • ff: Fur color is gray.
3. One of Each (Heterozygous)
   • Ff or fF: Fur color is orange (dominant is expressed).

Conclusion

• Dominant trait is always expressed over the recessive in heterozygous pairings.
• Upcoming topics: Homozygous vs Heterozygous alleles, Genotypes vs Phenotypes.

Additional Resources

• Watch related video on genes vs alleles for more foundational knowledge (linked in description).

• Next Steps: Leave questions in comments and watch upcoming videos for deeper understanding.
• Stay Tuned: More on alleles and genetic expressions coming soon.