BIOLOGY 11 – PRE-LAB EXERCISE Name: Answer Key 18+20 5 1. What is a gene? A unit of heredity. A region of DNA with instructions for making a specific protein. • How did you get two copies of each of your genes? One from my mother, one from my father. • What are alleles? Different versions of the same gene. • Define the term “homozygous.” The same two alleles for a given gene. • Define the term “heterozygous.” Two different alleles for a given gene. 2. What is the difference between your genotype and your phenotype? Genotype: which alleles are present for a specific gene. Phenotype: the observable trait resulting from that genotype. What is the difference between a dominant trait and a recessive trait? Dominant trait phenotype is observed with either homozygous or heterozygous genotype. Recessive trait phenotype is only observed if genotype is homozygous for that allele. 3.
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