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Exploring Chromosomal Disorders & Genetic Traits in a Survey

Delve into chromosomal disorders and explore genetic traits through a survey on characteristics like cleft chin, hair type, and more. Learn about alleles, genotypes, and dominant vs. recessive traits in a fun experiment design. Uncover why you look the way you do!

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Exploring Chromosomal Disorders & Genetic Traits in a Survey

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  1. What is a chromosomal disorder? • What does trisomy mean? • What is nondisjunction and when can it occur? • What is Kleinfelters? Turners? What sperm and eggs have to combine for these disorders to occur?

  2. We are going to take a survey for some specific traits… Please mark whether which characteristic you have Do you have a chin with a cleft? Or a chin without a cleft? WHY DO YOU LOOK THE WAY YOU DO??? This is a chin with a Cleft.

  3. Do you have a widows peak? • Widows peak How about an 80’s cut and crazy swoop bangs….. Just kidding.

  4. Do you have mid-digit hair? • That’s right, hair on your hand between the two digits. I do!

  5. Do you have attached ear lobes? Unattached Attached

  6. Do you have a hitchhikers thumb? hitchhikers Non- hitchhiker

  7. Can you roll your tongue?

  8. Are you ready to smell something gross? • Is your second toe longer than your big toe? What kind of weirdo takes a picture of their toes and puts it on the inter-net?

  9. Do you have Dimples like Miss Hollingworth? Divits in your cheeks? • When you cross your arms which do you put on top?

  10. Our Traits Presence of Traits in Miss H’s Class

  11. Do You see any patterns? • What is the relationship between percentages of various traits? • Are the traits distributed equally in our class?

  12. Why do you look the way you do? • You appearance is determined by the genes you have inherited from your mother and father. • There are different types of these genes which are called alleles. • For example there are different alleles for Ear shape • Ex attached, unattached • The physical appearance of each trait is called the phenotype.

  13. More on alleles.. • The specific alleles of a specific trait are the genotype • The dominant allele is written as a capital letter • The recessive allele is written as a lower case letter • If an allele is Dominant it will “cover up the other allele • Thus if the genotype is TT or Tt the dominant trait will show. If tt is the geotype the recessive trait is shown.

  14. Your job is to determine if a specific trait is recessive or dominant • Recessive traits show up 25% of the population • Dominant traits show up in 75% of t he population

  15. You job is to design an experiment to determine if a trait is recessive or dominant. • Choices of traits • Freckles or No Freckles • Broad Lips or thin lips • Left or right handed • Crossing Legs (Left over right or Right over left) • Bent pinkies or straight pinkies

  16. You will create your own • Purpose • Procedure (Must be approved before you run your experiment • Materials and Steps Data • Data Analysis • Conclusion

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