Question

Which of the following best illustrates an incomplete dominance inheritance pattern?

	A white-flowered plant is crossed with a blue-flowered plant and the resulting offspring all have white-flowers.
	A red-flowered plant is crossed with a yellow-flowered plant and the resulting offspring all have orange-flowers.
	A red-flowered plant is crossed with a white-flowered plant and the resulting offspring all have flowers with alternating red and white petals.
	A white-flowered plant is crossed with a purple-flowered plant and the resulting offspring all have purple-flowers.

Answer 1

Second option illustrates the incomplete dominance inheritance pattern appropriately and thus is the right answer. In incomplete dominance, one allele of the given trait is not completely expressed over its paired allele, rather an intermediate form of expression of the trait can be seen in the progeny, as given in the example in the second option where a red flowered plant is crossed with a yellow flowered plant, there is an intermediate colour exhibited by the progeny of the given plant which is orange. All the other options are incorrect as the example they illustrate with regards to incomplete dominance are incorrect.

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