A monohybrid cross is a cross that involved only one pair of contrasting traits.
From Mendel's experiments, he noticed that:
1. If he crossed a true breed tall pea plant with a true breed dwarf pea plant, all offspring in F1 generation were tall.
From Mendel's experiments, he noticed that:
1. If he crossed a true breed tall pea plant with a true breed dwarf pea plant, all offspring in F1 generation were tall.
2. If he intercrossed two tall pea plants from the first generation, some offspring in F2 generation were tall while the rest were dwarf.
He continued to test six other traits in a similar manner and his observations were as below:
One parent must be homozygous dominant (TT) while the other mist be homozygous recessive (tt).
Tall must be dominant because it is expressed in all F1 offspring.
Only one outcome (Tt) is possible.
Heterozygous TALL × Heterozygous TALL
Three of every four F2 offspring showed dominat phenotype while only one showed recessive phenotype.
Average dominant to recessive ratio is 3:1.
From these observations, Mendel derived the first three postulates of inheritance.
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