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Name: ______________________________ Date: ___________________ Period: _______ Observing Human Traits Lab Background: Physical traits are observable characteristics that are determined by genes. Genes are specific segments of DNA located on chromosomes that code for a particular trait. Most genes have two or more variations, called alleles. Some alleles are dominant over others and dominant alleles will be expressed (an organism’s phenotype or physical appearance) over recessive alleles. Recessive alleles may be present in an organism but expression will be masked in the presence of a dominant allele for the same gene. Recessive traits will only be expressed when there are two recessive alleles present in the genotype (the “code”). Keep in mind that it’s not always quite this simple. There are other factors that can affect trait expression, and most traits have several genes that influence expression. This lab is a basic introduction to dominant and recessive traits. Let’s get started! Directions: Circle the phenotype you have for each of the following human traits. Personal Traits Inventory Trait Handedness Phenotype Right handed Left handed Unattached Attached Tongue rolling Yes No Tongue folding Yes No Cheek dimples Yes No Freckles Yes No Cleft chin Smooth chin Hairline shape Widow’s peak Straight hairline Bent little finger Yes No Mid-digital hair Yes No Eye dominance Right-eye dominant Left-eye dominant Double jointed fingers Yes No Hitchhiker’s thumb Yes No Right thumb on top Left thumb on top Right arm on top Left arm on top Yes No Earlobes Chin Hand clasping Arm folding Long second toe ©2013 Tamra Young Name: ______________________________ Date: ___________________ Period: _______ Observing Human Traits Lab Background: Physical traits are observable characteristics and are determined by genes. Some human traits include: dimples, tongue rolling, and earlobes. There are two types of genes for each trait: dominant and recessive. For example, earlobes can either be unattached (dominant) or attached (recessive). If present, the dominant gene will always be expressed (the physical appearance of the individual) over the recessive gene. The recessive gene will only be expressed in the absence of the dominant gene. Keep in mind that it’s not always quite this simple. There are other factors that affect trait expression that will not be covered in class. This lab is a basic introduction to dominant and recessive traits. Let’s get started! Directions: Circle the expression you have for each of the following human traits. Personal Traits Inventory Trait Handedness Expression Right handed Left handed Unattached Attached Tongue rolling Yes No Tongue folding Yes No Cheek dimples Yes No Freckles Yes No Cleft chin Smooth chin Hairline shape Widow’s peak Straight hairline Bent little finger Yes No Mid-digital hair Yes No Eye dominance Right-eye dominant Left-eye dominant Double jointed fingers Yes No Hitchhiker’s thumb Yes No Right thumb on top Left thumb on top Right arm on top Left arm on top Yes No Earlobes Chin Hand clasping Arm folding Long second toe ©2013 Tamra Young Directions: Record the expressions for you and 19 classmates. Find the total and ratio of each. Classroom Traits Inventory Student Name Right/ left handed Attach/ unattach earlobes Double jointed fingers Roll tongue Hitchhiker’s thumb Bent little finger Widow’s peak Cleft/ smooth chin Right/ left eye dominant R/L A/U Y/N Y/N Y/N Y/N Y/N C/S R/L 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Total Ratio ©2013 Tamra Young
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