45. Cystic fibrosis and Phenylketonuria are common autosomal dominant disorders. 46. In a case of incomplete dominance, the phenotypic ratio of the F2 generation is the same as the genotypic ratio. 47. Each gamete carries one factor, now called an allele, for each inherited trait. 48. If an individual is heterozygous for a particular trait, the gametes that individual produces will contain 3/4 dominant and 1/4 recessive alleles. 49. Polygenic traits such as height or weight are often influenced by the environment of the organism. Â Â
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