Who figured this Genetics Stuff Out? Biology Standards 3a and b Genetic s.
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Transcript of Who figured this Genetics Stuff Out? Biology Standards 3a and b Genetic s.
Who figured this Genetics Stuff Out?
Biology Standards 3a and b
Genetics
Introduction• Genetics:
study of heredity
• Heredity: DNA passes
to each generation.
Traits
• Specific characteristics that are coded from DNA
Golden Fur
Black Chin
4 limbs
2 white ears
2 eyesTPS:
Describe traits of this animal
Genes Control Traits
• Genes: sequences of DNA
• Has 2 contrasting forms called alleles
Alleles
• Can either be dominant (shows up in phenotype) or recessive (does not show
up in presence of a dominant allele)• Called principle of dominance
HIStory• Gregor Mendel,
a botanist monk, worked on pea plants.
• Performed crosses of plants: pollen on female part of plant.
Sexy Pea
Plants!
P vs F1 vs F2 Generations
• P = Parents
• F1 = 1st Generation
• F2 = 2nd Generation
Laws!• Alleles
separate during formation of sex cells (gametes). Law of segregation
• Law of independent assortment
• Genes for diff. traits assort independently of each other.
• Ex: if you have brown hair does not mean you will get brown eyes…. traits separate independently
Laws!