Heterozygous Vs Homozygous Brief Introduction

Heterozygous Vs Homozygous

What is the difference between Heterozygous and Homozygous Individuals? 

Heterozygous Vs Homozygous: Difference Between Homozygous & Heterozygous is complex terms. Heterozygous Vs Homozygous differences are briefly described below :

Definition of Homozygous

Actually, the word Homo means “same”, and a word Zygous means “having zygotes of a definite type”.

Simply, we can able to intricate this term in the respective way that, “whenever both alleles of a specific gene are same which are extant on the Homologous chromosomes are said to be Homozygous. When both two genes share promptly detectable sequence similarities (nucleotide sequence in DNA or amino alkanoic acid sequence) in proteins they are inscribed or coded, are homologs. If two homologous genes occur within the same species as they’re known to be paralogous and their macromolecule proteins product are paralogs. Heterozygous Vs Homozygous described below:


An organism is known to be homozygous at a particular locus whenever it brings two indistinguishable (identical) copies of the genome influencing a trait located on the two reciprocal homologous chromosomes. (e.g., the genotype is RR or rr where R and r refer to the various attainable alleles of a similar gene). Such a cells or such individuals are referred to as homozygote.

Definition of Heterozygous

Hetero means that ‘different’ and azygous means ‘having zygotes of a specific kind‘. Therefore we are able to justify it by explaining that “when both two of the alleles located on the homologous chromosomes for a given genome completely different.


For example, one chromosome in homologous combination pair contains brown hair (R) and another chromosome contains black hair (r). Therefore the resultant genotype is Rr. It is said to be Heterozygous.

Heterozygous Vs Homozygous

Heterozygous and Homozygous:

Heterozygous Vs Homozygous: A gene has a homozygous or heterozygous phenomenon. The alleles of the two genes interact with each other to reproduce the new gene.

If an individual has both same alleles i.e. dominant or recessive than it said to be homozygous. In homozygous, new gene carries two same copies of parent genes. For example, both parents have alleles of blood type “A”, the offspring my has homozygous of these same both alleles of blood type “A”.

And organism is said to be heterozygous when new gene receive different alleles from both parents. In heterozygous, two different alleles exist for a particular gene. For example, one parent has blood type “A”, and other has blood type “B”, the offspring may have both different alleles as blood type “AB”.

Diagrammatic representation of Homozygous Vs Heterozygous

Heterozygous Vs Homozygous

Comparison Chart

Homozygous is the presence of two copies of the same allele which codes for a particular trait. Heterozygous is the presence of two different copies of alleles of a particular gene.
Have either dominant or recessive allele pairs (Ex: TT or tt)Have both dominant and recessive alleles (Ex: Tt)
Produce a single type of gametesProduce both types of gametes with dominant and recessive alleles.
Self-breeding produces the same trait over generationsSelf-breeding produces a combination of different Traits.
Do not show an extra vigourCan show extra vigour called hybrid vigour.
Homozygous-dominant and homozygous- recessive are the two types. Complete dominance, Incomplete dominance, and codominance are the three types.