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Explanation: Two alleles of a trait exhibit dominant-recessive behavior. The allele that can express itself in both homozygous and heterozygous condition is called "dominant" allele. On the other hand, the allele which is expressed only in homozygous genotype is termed as a recessive allele

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Each pair of alleles represents the genotype of a specific gene. Genotypes are said to be homozygous when there are two identical alleles at a given locus, and heterozygous when the two alleles differ. Alleles contribute to the organism's phenotype, which is the organism's outward appearance.

What do you mean by alleles?

  • An allele is a variant of a gene. Some genes have a variety of different shapes that are at the same position or genetic locus on a chromosome.
  • Humans are called diploid organisms because they have two alleles at each genetic locus, with one allele inherited from each parent.
  • An example is the human ABO blood group system; People with blood type AB have one allele for A and one for B.

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