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Home » A cross between two pea plants tall with axial flowers and dwarf with terminal flowers produced offsprings tall with axial flowers and tall with terminal flowers in the ratio 1 : 1. What will be the genotype of parents ? A) TTAa × ttaa B) TtAa × ttaa C) TtAA × ttaa D) TTAA × ttaa
A cross between two pea plants tall with axial flowers and dwarf with terminal flowers produced offsprings tall with axial flowers and tall with terminal flowers in the ratio 1 : 1. What will be the genotype of parents ? A) TTAa × ttaa B) TtAa × ttaa C) TtAA × ttaa D) TTAA × ttaa
biology | Biology
A cross between two pea plants tall with axial flowers and dwarf with terminal flowers produced offsprings tall with axial flowers and tall with terminal flowers in the ratio 1 : 1. What will be the genotype of parents ? A) TTAa × ttaa B) TtAa × ttaa C) TtAA × ttaa D) TTAA × ttaa

Correct option:(A)TTAa × ttaa

Solution:

  • Alleles for tallness (T) and axial flower (A) are dominant over that of dwarfism (t) and terminal flower (a) .
  • Since recessive traits are exhibited in homozygous genotypes only, the genotype of a dwarf parent with the terminal flower is “ttaa”.
  • To have both axial and terminal flowers in the progeny, the dominant parent should be heterozygous to allow the expression of a recessive allele in the next generation.
  • It makes the genotype of tall plant with axial flower “TTAa”.
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