The phenotypic ratio from crossing monohybrid between a homozygous recessive individual and a heterozygous individual is 1 : 1.
The recessive homozygous gene is the result of the fusion of two recessive genes from the two sex cells. The symbol for a recessive homozygous gene is two lowercase letters aa or aabb.
Heterozygous is a gene that has a pair of different alleles, so one is dominant and the other is recessive, so it is written with a combination of uppercase and lowercase letters, such as Aa or AaBb.
Crossing between a homozygous recessive (aa) individual and a heterozygous individual (Aa):
a a
A Aa Aa
a aa aa
Genotype ratio → Aa : aa = 1 : 1
Phenotype ratio → 1 : 1
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