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Human Phenotype Lab

Important Concepts. Remember it takes two copies of the gene.Different copies of genes, the letters, are called alleles. ex. H or hCapital letter = dominant (H)Lower case letter = recessive (h)For today's lab, COMPLETE DOMINANCE; Big letter always winsHH or Hh = show dominant traithh = show recessive trait.If Dominant, we don't know your 2nd allele, so show a H?Genotype is the

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Human Phenotype Lab

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    1. Human Phenotype Lab Are you dominant or recessive for each trait? What is your genotype and phenotype for each trait?

    2. Important Concepts Remember it takes two copies of the gene. Different copies of genes, the letters, are called alleles. ex. H or h Capital letter = dominant (H) Lower case letter = recessive (h) For today’s lab, COMPLETE DOMINANCE; Big letter always wins HH or Hh = show dominant trait hh = show recessive trait. If Dominant, we don’t know your 2nd allele, so show a H? Genotype is the “letters” of the genes Phenotype is the physical trait (what you see)

    3. Right or Left Handed? R? or rr

    4. Widow’s Peak – yes or no? W? or ww

    5. Mid-digital hair –yes or no? M? or mm

    6. Dimples – yes or no? D? or dd

    7. Unattached or Attached Ears? U? or uu

    8. Bent or Straight Little Fingers? B? or bb

    9. Do you have a blaze – yes or no? B? or bb

    10. Straight or bent thumb? S? or ss

    11. Rolling tongue – yes or no? R? or rr

    12. Right or Left thumb on top? R? or rr

    13. Freckles – yes or no? F? or ff

    14. Long 2nd toe? Yes or no? L? or ll

    15. Which leg crossed on top? Right or left? R? or rr

    16. PTC taster – yes or no? P? or pp

    17. Sodium Benzoate taster – yes or no? S? or ss

    18. Thiourea taster - Yes or no? T? or tt

    19. Question 1 Does being a dominant trait mean that most people have that trait?

    20. Question 2 Is it possible for parents who both have dimples to have a biological child who doesn’t have dimples? Prove your answer using the alleles. Hint: Dimples is a dominant trait.

    21. Question 3 We used a question mark when you had the dominant trait because we didn’t know your second letter. It could have been TT or Tt. What could you do in order to determine if your second allele is Big or little letter?

    22. Question 4 Come up with a way to remember the difference between genotype and phenotype.

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