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Do Now:

Do Now:. Amish and genetic variation:. Homework. Test tomorrow: Pull out your notebooks and all the terms and the lab write up. Those that are fully prepared can have one page with anything needed to aid them taking the test.

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Do Now:

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  1. Do Now: • Amish and genetic variation:

  2. Homework • Test tomorrow: • Pull out your notebooks and all the terms and the lab write up. • Those that are fully prepared can have one page with anything needed to aid them taking the test. • Others, only one half a sheet and only one side of that half sheet

  3. Homework – Thursday’s class • Read pages 338 – 343 • Define these terms: • Transformation • Bacteriophage

  4. Review • Write these questions and be prepared to answer them: • Why did Gregor Mendel choose the Pea to study genetics and what did he find? • The pea has a simple design. • Fertilization - • Hybrids • Pollination • Gametes

  5. Review • What is heredity: • The sum of the characteristics and potentialities genetically derived from one's ancestors • What are traits? • The sum of the characteristics and potentialities genetically derived from one's ancestors • What is the Law of Segregation? • Each parent passes along one trait (allele) to the off-spring • What is the difference between Genotype & Phenotype? • What is the difference between Homozygous & Heterozygous?

  6. Review • Genotype – the genetic makeup of a gene (TT, Tt, tt) • Homozygous –Same type of alleles (Tall – Tall= TT) or (short- short=tt) • Heterozygous – both different (Tall-short = Tt).

  7. Review To do a Punnett Square – Mom’s traits (Tt) & dad’s traits (tt). Can only do one trait at a time. In this case mom is tall and dad is short.

  8. Land fill lab • This is an example of what? (Two possible answers) • Inbreeding and / or Genetic Drift

  9. Dihybrid Di-hybrid – deals with two traits. (p. 316) – each box will have 4 alleles = BbTt X BbTt. B- Brown Hair, b – Red Hair, T – Tall, t – Short

  10. Dihybrid Do the following - BbTt X BbTt. B- Brown Hair, b – Red Hair, T – Tall, t – Short • BT bTBtbt • BT • bT • Bt • bt

  11. Ratios • How many Brown Hair and Tall will you have? • How many Brown Hair & short • How many Red Hair & Tall • How many Red Hair & short

  12. Quick review & new stuff • What is Co-Dominance? Give an example? • Incomplete Dominance? Give an example?

  13. Genetics • In humans, we have 23 sets of genes for a total number of chromosomes of 46.

  14. Genetics • In humans, we have 23 sets of genes for a total number of chromosomes of 46. Errors do occur such as Downs, were one extra chromosome appears. In Downs it appears on 21. Can occur on 18 too.

  15. Genetics • Most chromosomes are homologous – meaning each of the chromosomes has a pair from mom and from dad. • A cell containing both sets of homologous chromosomes is called diploid (2 sets). • Some cells contain only a single set of chromosomes called haploid.

  16. Before leaving Before you leave, clean up the area around your table. Make sure you have the homework(s) for tonight.

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