Monohybrid Cross

What is Monohybrid Cross?

A cross that follows the inheritance of a single gene with two alleles from one generation to the next. In the standard example two heterozygous parents, each with the genotype Tt, are crossed. Each parent produces gametes carrying either the dominant allele T or the recessive allele t in equal proportions, and combining them gives an expected genotype ratio of 1 TT to 2 Tt to 1 tt. Because T is dominant, three of those four genotypes give the same phenotype, producing the characteristic expected phenotype ratio of 3 tall to 1 short.

This definition is part of the Inheritance chapter in Cambridge O Level Biology.

Concepts related to Monohybrid Cross

• heterozygous
• punnett square
• genotype ratio
• phenotype ratio