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Genotype vs. Phenotype

- Start a new page - Add it to your TOC. Genotype vs. Phenotype. I recognize that genes carry information which determines traits. Learning target. The instructions for a specific trait Found on one section of DNA Y ou have a different gene(s) for each of the following traits: Hair color

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Genotype vs. Phenotype

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  1. - Start a new page - Add it to your TOC Genotype vs. Phenotype

  2. I recognize that genes carry information which determines traits. Learning target

  3. The instructions for a specific trait • Found on one section of DNA • You have a different gene(s) for each of the following traits: • Hair color • Eye color • Hitchhiker’s thumb • Tongue rolling • Height GENE

  4. The different forms of a gene. • Examples: • Hitchhiker’s thumb OR Straight thumb • Can roll tongue OR Can’t roll tongue • Blonde hair OR Black hair OR Brown hair OR Red hair • (Note: One allele comes from each parent.) allele

  5. Alleles that cover up all other alleles. • Hides, covers, masks, or over-powers • Always shows up when present (it dominates!) • Shown with UPPERCASE letters. • Examples: • H • B • A Dominant Alleles

  6. Alleles that get covered up by any dominant allele. • Shown with lowercase letters. • Examples: • h • b • a Recessive alleles

  7. When both alleles are the SAME • Homo = same • Examples: • HH = homozygous DOMINANT • hh = homozygous RECESSIVE Homozygous

  8. When both alleles are DIFFERENT • Hetero = different • Examples: • Hh • Qq • Rr heterozygous

  9. The genes that an organism has (Genotype = Genes) • Represented by letters • Examples: • Hh • BB • tt • Qq Genotype

  10. The traits or characteristics of an organism • What it looks like • (Phenotype = Features) • Examples: • Hair color • Eye color • Hitchhiker’s thumb • Tongue rolling • Height Phenotype

  11. EXAMPLES/PRACTICE

  12. Eye Color

  13. . (Use the letter “b”) B = brown allele (dominant) b = blue allele (recessive) Brown is dominant to blue

  14. Brown is dominant to blue. Brad Pitt Brad has blue eyes. What is his PHENOTYPE? What is his GENOTYPE?

  15. Brown is dominant to blue. Brad Pitt PHENOTYPE: blue eyes GENOTYPE: bb

  16. Brown is dominant to blue. Justin Bieber Justin has brown eyes. What is his PHENOTYPE? What is his GENOTYPE?

  17. Brown is dominant to blue. Justin Bieber PHENOTYPE: brown eyes GENOTYPE: BB or Bb

  18. Hairline

  19. (use the letter “h”) Widow’s peak is dominant to Straighthairline

  20. Widow’s peak is dominant to normal hairline. John Travolta John has a widow’s peak. What is his PHENOTYPE? What is his GENOTYPE?

  21. Widow’s peak is dominant to normal hairline. John Travolta PHENOTYPE: widow’s peak GENOTYPE: HH or Hh

  22. LeBron James Widow’s peak is dominant to normal hairline. LeBron has a straight hairline. What is his PHENOTYPE? What is his GENOTYPE?

  23. LeBron James Widow’s peak is dominant to normal hairline. PHENOTYPE: straight hairline GENOTYPE: hh

  24. Skin

  25. (use the letter “f”) Freckles are dominant to no freckles

  26. Jennifer Lopez Freckles are dominant to no freckles. JLo has no freckles. What is her PHENOTYPE? What is her GENOTYPE?

  27. Jennifer Lopez Freckles are dominant to no freckles. PHENOTYPE: no freckles GENOTYPE: ff

  28. Freckles are dominant to no freckles. Lindsay Lohan Lindsay has freckles. What is her PHENOTYPE? What is her GENOTYPE?

  29. Freckles are dominant to no freckles. Lindsay Lohan PHENOTYPE: freckles GENOTYPE: FF or Ff

  30. Digits (fingers and toes)

  31. (use the letter “d”) Polydactyly is dominant to 5 digits

  32. “normal” 5 digits Polydactyly is dominant to 5 digits. These people have 5 digits. What is the PHENOTYPE? What is the GENOTYPE?

  33. “normal” 5 digits Polydactyly is dominant to 5 digits. PHENOTYPE: 5 digits GENOTYPE: dd

  34. Polydactyly is dominant to 5 digits Polydactyly (extra digits) These people have Polydactyly. What is the PHENOTYPE? What is the GENOTYPE?

  35. Polydactyly is dominant to 5 digits Polydactyly (extra digits) PHENOTYPE: Polydactyly GENOTYPE: Dd or DD

  36. Albinism (recessive)

  37. More Practice

  38. Brown is dominant to blue. Rihanna Rihanna has brown eyes. What is her PHENOTYPE? What is her GENOTYPE?

  39. Brown is dominant to blue. Rihanna PHENOTYPE: brown eyes GENOTYPE: BB or Bb

  40. Lady Gaga Freckles are dominant to no freckles. Lady Gaga has no freckles. What is her PHENOTYPE? What is her GENOTYPE?

  41. Lady Gaga Freckles are dominant to no freckles. Lady Gaga has no freckles. PHENOTYPE: no freckles GENOTYPE: ff

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