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Mash

Mash. Mesomorph. Ectomorph. Endomorph. Ectomorph. Endomorph. Mesomorph. What is Genetics? Genetics – study of how traits are passed from parent to offspring. What are traits determined by?

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Mash

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  1. Mash

  2. Mesomorph Ectomorph Endomorph

  3. Ectomorph

  4. Endomorph

  5. Mesomorph

  6. What is Genetics? • Genetics – study of how traits are passed from parent to offspring

  7. What are traits determined by? • Traits are determined by the genes on the chromosomes. A gene is a segment of DNA that determines a trait.

  8. Dominant and Recessive Genes • Gene that prevents the other gene from “showing” – dominant • Gene that does NOT “show” even though it is present – recessive • Symbol – Dominant gene – upper case letter – T • Recessive gene – lower case letter – t Recessive color Dominant color

  9. Example: Straight thumb is dominant to hitchhiker thumb T= straight thumb t = hitchhikers thumb (Always use the same letter for the same alleles— No S = straight, h = hitchhiker’s) Straight thumb = TT Straight thumb = Tt Hitchhikers thumb =tt * Must have 2 recessive allelesfor a recessive trait to “show”

  10. Both genes of a pair are the same – • homozygous or purebred • TT – homozygous dominant • tt – homozygous recessive • One dominant and one recessive gene – heterozygous or hybrid • Tt – heterozygous BB – Black Bb – Black w/ white gene bb – White

  11. Genotype and Phenotype • Combination of genes an organism has (actual gene makeup) – genotype • Ex: TT, Tt, tt • Physical appearance resulting from gene make-up – phenotype • Ex: hitchhiker’s thumb or straight thumb

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