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Lecture 39

Lecture 39. Mr. Sover 1 December 2009. Pass in Homework. Do this quickly. GENETICS!. Why you look the way you do!. When offspring are produced by sexual reproduction, they vary from one another and from their parents. Recall metaphase of meiosis I….

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Lecture 39

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  1. Lecture 39 Mr. Sover 1 December 2009

  2. Pass in Homework • Do this quickly.

  3. GENETICS! • Why you look the way you do!

  4. When offspring are produced by sexual reproduction, they vary from one another and from their parents. • Recall metaphase of meiosis I…

  5. The combination of the two sets of parental chromosomes in the zygote determines its characteristics. • The passing of traits from parent to offspring is called…HEREDITY. • GENETICS is the science of heredity.

  6. The basis for genetics comes from a dude named…

  7. Gregor Mendel (1822-1884)

  8. What types of plants?

  9. Mendel studied the differences which he saw between many generations. • Mendel was trying to find trends in the numbers he was accumulating. • Quantitative data

  10. Pea plants reproduce sexually. • Usually, a pea plant will reproduce with itself.

  11. These plants will be considered pure. • Mendel made it his goal to breed plants which were opposites of each other.

  12. White pea plants mixed with purple pea plants… • Resulted in all PURPLE plants. • These offspring were called the F1 generation (filial generation).

  13. Then he bred the F1 generation together… • Of the 929 plants, 705 were purple and 224 were white. • Ratio of 3 to 1 • DOMINANT vs. RECESSIVE traits • Principle of dominance.

  14. The plant has egg and sperm. • Each sperm and egg have different characters or genes. • Mendel represented these genes by symbols. • Dominance is represented by capital letters… • The two genes combine in the fertilized egg (zygote) so that each new pea plant contains two genes for each trait.

  15. The parents were pure purple…WW (dominant) • White plants were ww (recessive) • Sperm and eggs would have one of those genes. • The gametes of purple plants would have the W gene. • The gametes of white plants would have the w gene. • All F1 plants would be…

  16. Ww! • All F1 plants would produce half their gametes with the W gene and half with the w gene. • Combining two F1 plants would result in which combination? (Ww X Ww)

  17. BUT MR. SOVER, HOW IN THE WORLD DO I FIGURE THIS OUT?!?!?!!!!!!!!!111

  18. Homework • P. 219 (1-3, 5)

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