The dominance pattern of a gene can be determined from the phenotypes of the parents and offspring. In the examples below, assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify each example as either complete dominance, incomplete dominance, or codominance. Complete dominance Incomplete dominance Codominance Answer Bank A mother with straight hair and a father with curly hair have a son with wavy hair. A black sheep and a white sheep produce a gray lamb. A pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers. A mother with type A blood and a father with type B blood have a daughter with type AB blood. A white cow and a red bull have a calf that is white with red spots (roan colored).
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- Complete dominance: the heterozygote shows the same phenotype as one homozygote (one allele completely masks the other). - Incomplete dominance: the heterozygote shows an intermediate phenotype between the two homozygotes (a blending). - Codominance: the Show more…
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The dominance pattern of a gene can be determined from the phenotypes of the parents and offspring. In the examples below, assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify each example as either complete dominance, incomplete dominance, or codominance. a) A pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers. b) A mother with type A blood and a father with type B blood have a daughter with type AB blood. c) A red snapdragon and a white snapdragon produce a pink snapdragon. d) A green fish and a yellow fish have mottled green and yellow offspring. e) A mother with straight hair and a father with curly hair have a son with wavy hair.
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