During a monohybrid cross involving a tall pea plant with a dwarf pea plant, the offspring populations were tall and dwarf in equal ratio. Work out a cross to show how it is possible.

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Solution

To have tall and dwarf progeny in equal ratio, both parents should have atleast one copy of recessive allele (t). This makes tall plant being a heterozygous dominant (Tt). Being recessive character, dwarfism can be expressed only by homozygous genotype; genotype of dwarf parent is "tt".
Parents : Tt x tt
Tt x tt T t
t Tt (tall) tt (dwarf)
Phenotypic ratio= 1 tall : 1 dwarf.

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