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Genetics I

Genetics I. An Introduction. Key Vocabulary:. genetics Heredity Genetic traits vs. acquired characteristics (nature) vs . (nurture) (raw talent) (specific skills). Key VOCAB:. Review homologs gene alleles. Key VOCAB: (New). genotype phenotype heterozygous homozygous

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Genetics I

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  1. Genetics I An Introduction

  2. Key Vocabulary: • genetics • Heredity • Genetic traits vs. acquired characteristics (nature) vs. (nurture) (raw talent) (specific skills)

  3. Key VOCAB: • Review • homologs • gene • alleles

  4. Key VOCAB: (New) • genotype • phenotype • heterozygous • homozygous • Law of Dominance • dominant • Recessive • environment

  5. Some human examples read “=“ as “codes for” B= brown eyes b = blue eyes D = dimples d = no dimples F = freckles f = no freckles M = migraines m = no migraines G = near-sighted g = normal vision

  6. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  7. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  8. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  9. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  10. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  11. All BIO 151 Studentshave three possible genotypes w respect to eye color:

  12. Question: What does meiosis have to do with genetics?? Remember: Homologs (matching chromosomes) separate into different gametes…….

  13. Matching genes (alleles) separate into different gametes during meiosis!

  14. Problem:Find all possible gametes for individuals w the following genotypes: • BB  • Bb  • BbFF  • BbMm  • FfDdmm  • MM 

  15. How do you predict the genotypes of the offsprng of any two individuals?? • (What do you do when it’s fourth down & 40?)

  16. Guide for Solving Genetic Problems: • Record genotypes of both parents • Record all possible gametes.(Don’t SKIP this step!!) • Construct a Punnet Box • ANSWER the question asked!

  17. Sample Punnet Box:

  18. Sample Punnet Box:

  19. Practice Problem #1: Bill is heterozygous for eye color. Jeannie has blue eyes. What is the probability that their daughter has blue eyes?

  20. Practice Problem #2 Fred is homozygous dominant for eye color and heterozygous for dimples. Wilma has blue eyes and no dimples. What is the probability that Pebbles is both blue-eyed & dimpled.(Show all work)

  21. Practice Problem #3 • Rachel is heterozygous for freckles and has blue eyes. Ross has no freckles and is heterozygous for eye color. What is the probability that their baby will be both blue-eyed and freckled?

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