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
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
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
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)
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
Normal (BB, Bb) Color Blindness (bb)
Can you see the number inside the circle?
If you cannot, you may be colorblind