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11-1 The Work of Gregor Mendel

11-1 The Work of Gregor Mendel. Pg. 263. A. Gregor Mendel’s Peas. 1. Genetics is the scientific study of inheritance. Listen to this story…. Once upon a time there were two cute white bunnies in the wild. The two bunnies fell in love and had many baby bunnies.

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11-1 The Work of Gregor Mendel

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  1. 11-1 The Work of Gregor Mendel Pg. 263

  2. A. Gregor Mendel’s Peas • 1. Genetics is the scientific study of inheritance.

  3. Listen to this story….. • Once upon a time there were two cute white bunnies in the wild. • The two bunnies fell in love and had many baby bunnies. • …..but there was one thing that could not be explained….

  4. Listen to this story….. • …where did the gray bunny come from?

  5. A. Gregor Mendel’s Peas • 2. Mendel, an Austrian monk, studied genetics using pea plants.

  6. A. Gregor Mendel’s Peas • 3. Pea plants undergo fertilization(joining of male and female reproductive cells) when pollen (male reproductive cells) joins the female reproductive cells in the ovaries.

  7. A. Gregor Mendel’s Peas • 4. The pea plants at Mendels Monastery were true-breeding, allowed to self-pollinate, producing identical copies.

  8. A. Gregor Mendel’s Peas • Mendel wondered what would happen if he pollinated two different plants?

  9. B. Genes and Dominance • 1. Mendel studied 7 traits. • 2. Traits are specific characteristics that vary from one individual to another. • Examples: Plant Color, Plant Height, Seed Texture

  10. Activity Break! • Identify which of the following 10 human traits you have by placing a check mark beside that trait. • Compare the traits you have with other students in the classroom. • FIRST, lets predict which traits are MOST common!

  11. Tongue Roller • Non-Tongue Roller • Attached Earlobes • Unattached earlobes • Dimples • No Dimples • Right-handed • Left-Handed • Widow's Peak • Straight Hairline  Left Thumb on top when Hands Crossed • Right Thumb on top when Hands Crossed • Hair on mid-digit of hand • No hair on mid-digit of hand • Bent little finger • Straight little finger • Second toe longer than big toe • Second toe not longer than big toe

  12. B. Genes and Dominance • 3. P= Parental Generation F= Filial Generation • 4. Offspring from parents with different traits are called hybrids.

  13. B. Genes and Dominance • 5. The hybrids Mendel produced, surprisingly, only showed the traits of one of the parents.

  14. B. Genes and Dominance • 6. Mendel concluded that traits were passed on as units, called genes, that come in two forms, called alleles.

  15. B. Genes and Dominance • 7. The law of dominance states that some alleles are dominant and some alleles are recessive.

  16. C. Segregation • Do the recessive alleles disappear?!?!?! • Mendel Tested that too!!!!

  17. C. Law of Segregation • 1. Mendel crossed Filial one (F1) plants to each other to produce Filial two (F2) plants.

  18. C. Segregation • 2. Mendel suggested that during gamete formation (MEIOSIS), the alleles separate into different cells.

  19. C. Segregation • 3. The law of segregation states that alleles segregate (separate) from each other so that each gamete only carries one copy of each gene.

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