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Mendeloids

Mendeloids. Planning Form – Investigation 7. Eyebrows. X. P 1. Bushy. Smooth. F 1. All offspring have bushy eyebrows. Eyebrows. Locus, Loci. METAPHASE OF MEIOSIS I. Bushy. TELOPHASE OF MEIOSIS I. TELOPHASE OF MEIOSIS II. Eyebrows. B. METAPHASE OF MEIOSIS I. Bushy BB.

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Mendeloids

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  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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