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  4. In a typical Mendelian cross which is a dihybrid cross, one parent is homozygous for both dominant traits and another parent is homozygous for both recessive traits. In the f2 generation, both parental combinations and recombinations appear. The phenotypic ratio of parental combinations to recombinations is ..................

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Q. In a typical Mendelian cross which is a dihybrid cross, one parent is homozygous for both dominant traits and another parent is homozygous for both recessive traits. In the $f_2$ generation, both parental combinations and recombinations appear. The phenotypic ratio of parental combinations to recombinations is ..................

KCETKCET 2011Principles of Inheritance and Variation

Solution:

In 9 : 3 : 3 : 1 ratio, (9 + 1) 10 are parental and (3 + 3) 6 are recombinants.