Binomial Expression in Mendelian Genetics — NEET Biology
📚 Practice ConceptThe 1/4: 1/2: 1/4 ratio of TT: Tt: tt is mathematically condensable to the form of the binomial expression (ax +by)², that has the gametes bearing genes T or t in equal frequency of ½. The expression is expanded as given below:
Which of the following statements regarding dihybrid crosses and Mendel's laws are correct? S1: In a cross between true-breeding parents RRYY and rryy, the F1 generation (RrYy) will produce four types of gametes (RY, Ry, rY, ry) in equal proportions. S2: The Law of Independent Assortment directly explains the 9:3:3:1 phenotypic ratio observed in the F2 generation of a dihybrid cross when genes are unlinked. S3: The segregation of alleles for seed colour is entirely dependent on the segregation of alleles for seed shape during gamete formation in a dihybrid cross. S4: The probability of an offspring having the genotype rryy from a self-pollinated F1 dihybrid (RrYy x RrYy) is 1/8. S5: If two genes are tightly linked on the same chromosome, their F2 generation phenotypic ratio in a dihybrid cross will significantly deviate from 9:3:3:1.
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