A pure breeding tall pea plant with round seeds is crossed with a dwarf pea plant with wrinkled seeds. What is the expected percentage of F ₂ progeny that will be dwarf with wrinkled seeds?

Step-by-step solution

Let the allele for tallness be T and dwarfness be t . Let the allele for round seeds be R and wrinkled seeds be r . The cross is between pure breeding tall round ( TTRR ) and dwarf wrinkled ( ttrr ) plants. The F₁ generation will be heterozygous tall and round ( TtRr ). Selfing of F₁ ( TtRr TtRr ) produces F₂ progeny in the phenotypic ratio of 9:3:3:1 . The proportion of dwarf and wrinkled ( ttrr ) progeny in the F₂ generation is 1 16 . Percentage of dwarf wrinkled progeny = 1 16 100 % = 6.25 % . Answer: 6.25 %