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Mendelian Genetics: Analysis of Eyebrow Traits and Associated Alleles

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This investigation explores the inheritance patterns of eyebrow traits in Mendelian genetics. It focuses on two types of eyebrow phenotypes—bushy (dominant) and smooth (recessive)—and utilizes Punnett squares to illustrate possible gametes and genotypes from parental combinations. The study also examines related traits such as digit number and skin color inheritance, distinguishing between monogenic and polygenic traits, as well as autosomal and sex-linked traits. The findings enhance understanding of genetic variation and expression in these phenotypic traits.

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Mendelian Genetics: Analysis of Eyebrow Traits and Associated Alleles

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Presentation Transcript

  1. Mendeloids Planning Form – Investigation 7

  2. Eyebrows X P1 Bushy Smooth F1 All offspring have bushy eyebrows

  3. Eyebrows Locus, Loci METAPHASE OF MEIOSIS I Bushy TELOPHASE OF MEIOSIS I TELOPHASE OF MEIOSIS II

  4. Eyebrows B METAPHASE OF MEIOSIS I Bushy BB TELOPHASE OF MEIOSIS I B TELOPHASE OF MEIOSIS II B B B

  5. Eyebrows b METAPHASE OF MEIOSIS I Smooth bb TELOPHASE OF MEIOSIS I b TELOPHASE OF MEIOSIS II b b b

  6. Punnett Square Possible gametes for the two parents bb = homozygous recessive b b B Bb Bb BB = homozygous dominant B Bb Bb Possible genotypes from these two parents Bb = offspring are heterozygous

  7. Eyebrows • Bushy is the dominant allele • B • Smooth is caused by a recessive allele • b • Monotypic gene – either bushy or smooth, no intermediate expressions • Autosomal

  8. Digits • Number of toes – 2 or 3 • 2 digit x 3 digit = all 2 digits • Which is dominant? • Is this trait monogenic or polygenic? • Sex-linked or autosomal?

  9. Skin Color solid large spots stippled small spots medium spots

  10. Skin Color • Polygenic • AABB = solid • AABb or AaBB = large spots • AaBb or aaBB or AAbb = medium spots • Aabb or aaBb = small spots • aabb = stippled • Autosomal

  11. Hearing • Dominant = normal hearing • Recessive = deaf • Sex-linked (= gene is present on the X chromosome but absent on the Y) • XX = female; XY = male XAXA XAXa XaXa XAY XaY

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