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Activity 3. Incomplete dominance As you saw in the case of codominance, in which both alleles are fully expressed phenotypically, the "rule" that one allele must be dominant over another doesn't always hold. Another exception is incomplete dominance, in which a heterozygous individual shows a phenotype that is intermediate between the phenotypes caused by either one of the two separate alleles. For example, in certain (but not all) flower species, the allele for red color (C?) is incompletely dominant with respect to the allele for white (C?). A heterozygous individual (C?C?) is pink. One example of this is seen in the species known as four-o'clocks. 16. A gardener crosses two pink four-o'clocks. What are his expected genotypic and phenotypic results? Give the expected proportions. 17. If a pink four-o'clock is crossed with a white one, what results are expected?

          Activity 3. Incomplete dominance

As you saw in the case of codominance, in which both alleles are fully expressed phenotypically, the "rule" that one allele must be dominant over another doesn't always hold. Another exception is incomplete dominance, in which a heterozygous individual shows a phenotype that is intermediate between the phenotypes caused by either one of the two separate alleles.

For example, in certain (but not all) flower species, the allele for red color (C?) is incompletely dominant with respect to the allele for white (C?). A heterozygous individual (C?C?) is pink. One example of this is seen in the species known as four-o'clocks.

16. A gardener crosses two pink four-o'clocks. What are his expected genotypic and phenotypic results? Give the expected proportions.

17. If a pink four-o'clock is crossed with a white one, what results are expected?

Activity 3. Incomplete dominance

As you saw in the case of codominance, in which both alleles are fully expressed phenotypically, the "rule" that one allele must be dominant over another doesn't always hold. Another exception is incomplete dominance, in which a heterozygous individual shows a phenotype that is intermediate between the phenotypes caused by either one of the two separate alleles.

For example, in certain (but not all) flower species, the allele for red color (C?) is incompletely dominant with respect to the allele for white (C?). A heterozygous individual (C?C?) is pink. One example of this is seen in the species known as four-o'clocks.

16. A gardener crosses two pink four-o'clocks. What are his expected genotypic and phenotypic results? Give the expected proportions.

17. If a pink four-o'clock is crossed with a white one, what results are expected?

Added by Alisha W.

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