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Explain and illustrate incomplete dominance using a cross between red and white flowered plants, showing the Punnett square and phenotype ratios.

Biology

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Answer

3.3

1 Red : 2 Pink : 1 White\text{1 Red : 2 Pink : 1 White}

Step-by-step solution

5 steps

Part 3.1

The type of dominance shown is incomplete dominance.

Part 3.2

The reason is that when red-flowered plants are crossed with white-flowered plants, the offspring have an intermediate phenotype (pink flowers), meaning neither allele is completely dominant over the other.

Part 3.3

1 Red : 2 Pink : 1 White\text{1 Red : 2 Pink : 1 White}

  1. State the parental phenotypes and genotypes.

    Parental Phenotypes: Pink ×\times Pink
    Parental Genotypes: RW ×\times RW

  2. Determine the gametes produced by each parent.

    Gametes from first parent: R, W
    Gametes from second parent: R, W

  3. Use a Punnett square to determine the genotypes of the offspring.

    GametesRWRRRRWWRWWW\begin{array}{|c|c|c|} \hline \text{Gametes} & \text{R} & \text{W} \\ \hline \text{R} & \text{RR} & \text{RW} \\ \hline \text{W} & \text{RW} & \text{WW} \\ \hline \end{array}

  4. Determine the genotypes and phenotypes of the offspring.

    Genotypes:

    • 1 RR
    • 2 RW
    • 1 WW

    Phenotypes:

    • RR: Red flowers
    • RW: Pink flowers
    • WW: White flowers

  5. State the ratio of the expected phenotypes.

    The ratio of expected phenotypes is 1 Red : 2 Pink : 1 White\boxed{\text{1 Red : 2 Pink : 1 White}}.

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