Backcross

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Backcross (Bc) refers to mating of heterozygous F1 generation individual with the homozygous parental generation individual. In the presence of complete dominance (A > a), the following genotypic and phenotypic ratios can be found in the Bc generation:

Monohybridism (single locus / gene, two alleles)[✎ edit | edit source]

BcMonohybridism:

  • Aa x AA

Genotype ratio: 1 (AA) : 1 (Aa)

Phenotype ratio: uniform

DominantBc.png



  • Aa x aa

Genotype ratio: 1 (Aa) : 1 (aa)

Phenotype ratio: 1 (Aa) : 1 (aa)

RecessiveBc.png


Dihybridism (two loci / genes with two alleles each)[✎ edit | edit source]

BcDihybridism:

  • AaBb x AABB

Genotype ratio': 1 (AABB) : 1 (AABb) : 1 (AaBB) : 1 (AaBb)

Phenotype ratio: uniform

DihybriddomBc.png



  • AaBb x aabb

Genotype ratio: 1 (AaBb) : 1 (Aabb) : 1 (aaBb) : 1 (aabb)

Phenotype ratio: 1 : 1 : 1 : 1

DihybridrecBc.png



Links[✎ edit | edit source]

Related articles[✎ edit | edit source]

Homozygote

Heterozygote