Dihybrid Cross and Dual Trait Segregation — NEET Biology
📚 Practice ConceptLet us use the genotypic symbols Y for dominant yellow seed colour and y for recessive green seed colour, R for round shaped seeds and r for wrinkled seed shape. The genotype of the parents can then be written as RRYY and rryy. The cross between the two plants can be written down as in showing the genotypes of the parent plants. The gametes RY and ry unite on fertilisation to produce the F₁ hybrid RrYy. When Mendel self hybridised the F₁ plants he found that 3/4th of F₂ plants had yellow seeds and 1/4th had green. The yellow and green colour segregated in a 3:1 ratio. Round and wrinkled seed shape also segregated in a 3:1 ratio; just like in a monohybrid cross.
Match the following traits in pea plants with their correct dominant allele symbols as used in Mendelian genetics: Column I Column II A. Tall stem height I. G B. Green pod colour II. Y C. Violet flower colour III. T D. Round seed shape IV. V E. Yellow seed colour V. R
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