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Genotypic ratio of a dihybrid cross is...

Genotypic ratio of a dihybrid cross is

A

`1:4:6:4:1`

B

`9:3:3:1`

C

`1:2:1`

D

`1:2:2:4:1:2:1:2:1`

Text Solution

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The correct Answer is:
D
Genotypic ratio of a dihybrid cross is 1:2:2:4:1:2:1:2:1.
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The following table shows the F_2 generation of a ihybrid cross. Identify the 'Phenotype' with homozygous recessive genotype. Find A:B:C:D.

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Knowledge Check

  • Genotypic ratio of a monohybrid cross is

    A
    I:2:1
    B
    3:I
    C
    9:3:3:1
    D
    I:I:I

  • The total number of progeny obtained from a dihybrid cross is 1280 in F2 -generation. How many of them are recombinant type?

    A
    240
    B
    360
    C
    480
    D
    720

  • In quantitative inheritance, F_(2) ratio obtained in a dihybrid cross is

    A
    `1:4:6:4:1`
    B
    `15:1`
    C
    `12:3:1`
    D
    `9:7`

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    State whether the following statement. is true or false. If false, rewrite it by changing the word underlined. in a normal dihybrid cross, phenotypic ratio is 9:3:3:1 .

    Number of genotypes found in F_(2) progeny of a dihybrid cross is

    Read the following statements and find out the incorrect statements. a. Though the genotypic ratios can be calculated using mathematical probability, by simply looking at the phenotype of recessive trait, it is not possible to know the genotypic composition. b. The 1/4: 1/2: 1/4 ratio of TT: Tt: tt is mathematically condensable to form of the binomial expression (ax + by)?, that has the gametes bearing genes T and t in equal frequency of 1/2. c. Based on his observation on dihybrid crosses Mendel proposed two rules that are called Principles or Laws of Inheritance: the First Law or Law of Dominance and the Second Law or Law of Segregation. d. If in test cross, all the progenies shows dominant trait then the unknown parent is heterozygous dominant. e. ABO blood groups are controlled by three alleles I^(A), I^(B) and i. I^(A) and I^(B) produce a slightly different type of the sugar while allele i doesn't produce any sugar.

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