In the early 20th century, the following information was discovered about comb shape in chickens. If a chicken had a dominant R allele and was homozygous recessive for the P gene, then the comb was rose-shaped. If a chicken had a dominant P allele and was homozygous recessive for the R gene, then the comb was pea-shaped. However, if a chicken had both a dominant P allele and a dominant Rallele, then the comb was walnut-shaped. Homozygous recessive alleles for both genes resulted in the single comb shape. The phenotypic expression of comb shape in chickens is the result of what phenomenon? * O Penetrance O Incomplete dominance O Codominance O Epistasis

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Nutrition and Digestion

The process of consuming nutrients to utilize them for various biological purposes is known as nutrition. The substances absorbed from food are known as nutrients. They serve different important functions in the body, such as repairing wounds and damages, generating energy for metabolism, and regulating biochemical reactions.