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In a Mendelian monohybrid cross, the F2 ...

In a Mendelian monohybrid cross, the `F_2` generation shows identical genotypic and phenotypic ratios. What does it tell us about the nature of alleles involved? Justify your answer.

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In a monohybrid cross, starting with parents which homozygous dominant and homozygous recessive `F_1` would be heterozygous for the trait and would express the dominant allele. But in case of incomplete dominance a monohybrid cross shows the result as follows.

= Phenotypic ratio `to ` Red : Pink : White :: 1:2:1
= Genotypic ratio `to` RR : Rr: rr ::1:2:1
= Alleles can show incomplete Dominance when genotypic and phenotypic ratios are same.
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Knowledge Check

  • Monohybrid cross F_1 progeny Tt is inbred. What will be the maximum types of F_2 genotypes ?

    A
    A. 3
    B
    B. 2
    C
    C. 4
    D
    D. 1

  • In Mirabilis jalapa red and white flowers are crossed, what can be phenotype and genotype of F_2 generation ?

    A
    A. 1:2:1 and 3:1
    B
    B. 3:1 and 1:2:1
    C
    C. 1:2:1 and 1:2:1
    D
    D. 9:3 : 4 and 3 : 1

  • If dihybrid cross the F_1 heterozygous plants are self fertilized to produce an F_2 generation and if offspring are computed in punett square the phenotypic F_2 ratio as per Mendel.s independent assortment will yield.

    A
    `9:7`
    B
    `9:3:3:1`
    C
    ` 9: 6:1`
    D
    `12 : 3:1 `

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