dominant and recessive traits. what are traits? physical traits – can be seen by others – eye...
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![Page 1: Dominant and Recessive Traits. What are traits? Physical Traits – Can be seen by others – Eye color, hair color, height, left handed Acquired Traits –](https://reader031.vdocument.in/reader031/viewer/2022012918/551460ff550346414e8b58fc/html5/thumbnails/1.jpg)
Dominant and Recessive Traits
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What are traits?• Physical Traits
– Can be seen by others– Eye color, hair color, height, left handed
• Acquired Traits– Learned skills– Playing a sport, riding a bike, playing a musical
instrument
• Behavioral Traits– Instinctual actions– Nest building and migration
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Review Terms Used in Modern Genetics
• Genotype– The particular alleles (genes) an individual carries– They are inherited from your biological parents– Genes control your traits
• Phenotype– An individual’s observable traits
• What people can SEE when they look at you
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Review Terms Used in Modern Genetics
• An individual with non-identical alleles of a gene is heterozygous for that gene– Examples: Bb, Tt, Aa
• An individual with identical alleles of a gene is homozygous for that gene– Examples: BB or bb, TT or tt
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Terms Used in Modern Genetics
• An allele is dominant if its effect masks the effect of a recessive allele paired with it– Capital letters (A) signify dominant alleles;
lowercase letters (a) signify recessive alleles– Homozygous dominant (AA)– Homozygous recessive (aa)– Heterozygous (Aa)
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What traits do you have?
• We will go through the most common traits that people have
• On your sheet, record if you have the mentioned trait or not
• You may have to ask your neighbor for help
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Detached (EE, Ee) or attached (ee) Earlobes
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Can Tongue Roll (TT, Tt) or Can’t (tt)
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Dimples (DD, Dd) No Dimples (dd)
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Right (RR, Rr) or Left (rr) handed?
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Freckles (FF, Ff) No Freckles (ff)
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Curly (HH, Hh) or Straight (hh)
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Cleft Chin (CC, Cc) or No Cleft (cc)
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Allergies (AA, Aa) or No Allergies (aa)
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Hand Clasp Right over Left?
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Normal (BB, Bb) Color Blindness (bb)
Can you see the number inside the circle?
If you cannot, you may be colorblind
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Widow’s Peak (WW, Ww) or Straight (ww)
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Data
• We will now record our class data and graph our results
• Does our data support which genes are dominant and which genes are recessive?
• What about the whole 7th grade?