PreLab1820

PreLab1820 - What is their genotype? • What is the...

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BIOLOGY 11 – PRE-LAB EXERCISE Name: 18+20 1. What is a gene? How did you get two copies of each of your genes? What are alleles? Define the term “homozygous.” Define the term “heterozygous.” 2. What is the difference between your genotype and your phenotype? What is the difference between a dominant trait and a recessive trait? 3. What is a “Punnett Square”? 4. The symbol for the “Freckles” allele is “ F ” and the symbol for the “No freckles” allele is “ f ”. Which allele is recessive? And which is dominant? How do you know? What is the genotype of someone without freckles? What is/are the genotype(s) of the gametes from someone without freckles? What is the phenotype of someone heterozygous for freckles?
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Unformatted text preview: What is their genotype? • What is the phenotype of someone homozygous dominant for freckles? What is their genotype? 5. What are homologous chromosomes (= homologues)? • Which gender, in humans, has sex chromosomes that are homologous? Name the chromosomes. • Which gender, in humans, has sex chromosomes that are not homologous? Name the chromosomes. 6. What is meant by a sex-linked trait? • Why are males more often affected by X-linked diseases than are females? 7. Give an example of a recessive genetic disorder. • Give an example of a dominant genetic disorder. • In a pedigree, what symbol indicates a normal female? • In a pedigree, what symbol indicates a male affected with the genetic disorder?...
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This note was uploaded on 09/02/2011 for the course BIOL 11 taught by Professor Heyer during the Fall '08 term at UCSD.

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