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Incomplete Dominance - CBSE (Science) Class 12 - Biology

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Question

Explain the following terms with example

Incomplete dominance

Solution 1

Incomplete dominance : Incomplete dominance may be defined as the partial /expression of both alleles in a heterozygote so that the phenotype is intermediate between those of two homozygotes. In this none of the allele is completely dominant, e.g., Pink colour flower in dog flower. In Mirabilis jalapa & Snapdragon or dog flowers, there are two types of flower colour in pure state-red & white. When the two types of plant are crossed, the hybrid or plants of Fj generation have pink flowers. The pink colour apparently appears either due to mixing of red & white colours (incomplete dominance) or expression of a single gene for pigmented flower which produces only pink colour.

Solution 2

Incomplete dominance - Incomplete dominance is a phenomenon in which one allele shows incomplete dominance over the other member of the allelic pair for a character. For example, a monohybrid cross between the plants having red flowers and white flowers in Antirrhinum species will result in all pink flower plants in F1generation. The progeny obtained in F1 generation does not resemble either of the parents and exhibits intermediate characteristics. This is because the dominant allele, R, is partially dominant over the other allele, r. Therefore, the recessive allele, r, also gets expressed in the F1 generation resulting in the production of intermediate pink flowering progenies with Rr genotype.

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APPEARS IN

 NCERT Solution for Biology Textbook for Class 12 (2018 to Current)
Chapter 5: Principles of Inheritance and Variation
Q: 13.2 | Page no. 94

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Solution Incomplete Dominance Concept: Inheritance of One Gene - Law of Segregation - Incomplete Dominance.
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