unit_4_genetic_crosses_lab.docx - 4.03 4.04 Lab Genetic...

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4.03 & 4.04 Lab: Genetic Crosses Lab Report Part 1: Monohybrid Cross—Predicting Freckles in an F1 Generation Apply your understanding of how alleles assort and combine during reproduction to evaluate a scenario involving a monohybrid cross. The allele for having freckles ( F ) is dominant over the allele for not having freckles ( f ) . Having freckles is a dominant trait, and the lack of freckles is a recessive trait. In this example, a person with freckles is represented as either FF or Ff , and a person with no freckles is represented as ff Freckles: No Freckles: . (2 points) 1 Imagine a mother and a father who both have freckles and are heterozygous for the trait, or both have the genotype Ff . They are the P generation, or parent generation. Create a Punnett square to show their offspring, the F1 generation. Part 1 Punnett Square F f F f (2 points) 2 Calculate the ratios of the genotypes and phenotypes of the offspring in the F1 generation. Ratio of Genotypes (# FF : # Ff : # ff) Answer - Ratio of Phenotypes (# with freckles : # no freckles ) Answer - Part 2: Incomplete Dominance—Predicting Flower Color in Snapdragons Snapdragons are popular garden plants that produce brightly colored flowers. When a plant that is homozygous for white flowers is crossed with a plant that is homozygous for red flowers , all offspring are pink . Snapdragons are an

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