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11/6/13 Topic: Quiz & Introduction to Heredity Do Now: 1. 5 minutes to study for quiz!!

11/6/13 Topic: Quiz & Introduction to Heredity Do Now: 1. 5 minutes to study for quiz!!. Could the two pigeons on the left produce offspring that have the traits of the pigeon on the right?. How can we find out. Heredity is the process of passing genes from generation to generation.

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11/6/13 Topic: Quiz & Introduction to Heredity Do Now: 1. 5 minutes to study for quiz!!

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  1. 11/6/13 Topic: Quiz & Introduction to Heredity Do Now: 1. 5 minutes to study for quiz!!

  2. Could the two pigeons on the left produce offspring that have the traits of the pigeon on the right?

  3. How can we find out • Heredity is the process of passing genes from generation to generation. • Genes are segments of DNA that control the traits that we possess • Genes come in different forms which are known as alleles(ex: height, skin color, hair texture).

  4. Different types of alleles You have TWO alleles for every gene. One from Mom. One from Dad.

  5. 3 Combinations of Alleles Genotype: The combination of alleles that an individual has

  6. What about the way we look? • Phenotype: The expression of the genotype • The way a person looks or the characteristics they possess • The trait itself

  7. Try to identify each as a genotype or phenotype. • Curly hair • Rr • AA • Green eyes • Long legs • pp

  8. 11/7/13 Topic: More Heredity! Do Now: • Is “B” a dominant or recessive allele? How can you tell? • Is “brown hair” a genotype or phenotype? • Is Ll homozygous or heterozygous? How do you know?

  9. From genotype to phenotype A = straight hair, a = curly hair • What is the dominant trait? • If my genotype is AA, what is my phenotype? • If my phenotype is curly hair, what is my genotype? • If my genotype is Aa, what is my phenotype?

  10. 11/8/13 Topic: Genotype to Phenotype Do Now: • Explain, in your own words, the difference between genotype and phenotype. • Where do the alleles for each gene come from? • Is RR homozygous or heterozygous? How do you know? • If R = Long legs and r = short legs, what is the phenotype for rr?

  11. Incomplete Dominance Not every trait has only two options. Can you think of any human features that have more than two possible phenotypes?

  12. Incomplete Dominance When a trait follows the rules of incomplete dominance, the heterozygous phenotype is “between” the dominant and recessive.

  13. Classwork: Genetics with a Smile We are doing parts A, B, and C today! • You will flip the coin: • Heads: Dominant allele is passed down. • Tails: Recessive allele is passed down.

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