alleles

• Genes are DNA sections that code for specific proteins or functional RNA, playing a crucial part in biological functions.

  Alleles, however, are variations of these genes, leading to diverse traits such as eye color. 
• Alleles are variations of a gene.
• Homozygous are 2 same alleles in a gene.

  Heterozygous are 2 different alleles in a gene.
• A dominant allele only needs to be inherited from one parent in order for the characteristic to show up in the phenotype.

  A recessive allele needs to be inherited from both parents in order for the characteristic to show up in the phenotype.
• Genotype is the combination of alleles that control each characteristic.
• Phenotype is the observable characteristics of an organism.