In a cross between true-breeding red-flowered and true breeding white-flowered plants, the Filial 1 (F1) progeny was pink. This is a case of which type of inheritance?
Incomplete Dominance
In incomplete dominance, neither allele of a gene pair is fully dominant over the other, so the heterozygote shows an intermediate (blended) phenotype rather than the phenotype of one parent.
The classic example is the four o'clock plant (<i>Mirabilis jalapa</i>): crossing true-breeding red (RR) with true-breeding white (rr) gives F1 that are all pink (Rr) — a colour intermediate between red and white.
This differs from complete dominance, where F1 would look exactly like the dominant parent (red), and from co-dominance, where both alleles are fully and separately expressed so the flower would show distinct red and white patches, not a uniform pink blend.
Hence, a pink F1 from red × white true-breeding parents is a case of incomplete dominance.
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Important Questions from Genetics and Evolution
Different varieties of the same gene are called
In a sexually reproducing organism, which one of the following statements is appropriate both for the parent and offspring?
In most prokaryotes, the chromosome number is:
Bacterial DNA is referred to as naked because it is not associated with:
The two important features of sexual reproduction in higher organisms that create genetic diversity in offspring are
