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Humans have two sets of chromosomes.

Humans have two sets of chromosomes.

Homozygous and heterozygous are terms that are used to describe allele pairs. Individuals carrying two identical alleles (RR or rr) are known as homozygous. While individual organisms bearing different alleles (Rr) are known as heterozygous.

For example, assume gene of hair colour has two alleles, one of the allele codes for brown (R) and the other codes for black (r).

Homozygous will have the same colour alleles on homologous pairs, i.e. ‘RR’ or ‘rr’ and the heterozygous will have different alleles on homologous pair of chromosomes, i.e., Rr.

In this article, let us discuss the difference between homozygous and heterozygous.

Homozygous and heterozygous conditions help in determining dominant and recessive traits and inheritance pattern of genes.

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It has two same copies of the same allele coding for a particular trait.

It contains two different copies of alleles coding for a particular trait.

Contains only one type of allele, either dominant or recessive

Contains different alleles for a trait. Both dominant and recessive

Self-fertilization results in the repetition of the same traits over generations

Self-fertilization results in different combination of traits over the next generations

Only one type of gamete is produced

It can be either homozygous dominant or homozygous recessive

Heterozygous alleles can show complete dominance, codominance or incomplete dominance