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3/10/14 116 th Day of School

3/10/14 116 th Day of School. Learning goal (7.L.2.1): I will be able to explain why offspring that result from sexual reproduction (fertilization and meiosis) have greater genetic variation than offspring that result from asexual reproduction (budding and mitosis) .

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3/10/14 116 th Day of School

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  1. 3/10/14116th Day of School Learning goal (7.L.2.1): I will be able to explain why offspring that result from sexual reproduction (fertilization and meiosis) have greater genetic variationthan offspring that result from asexual reproduction (budding and mitosis). Due Today:Meiosis diagram and progress reports Evening Assignment: Finish vocabulary flashcards or chart; Study for Test

  2. On the slip of paper write your name and answer the following questions: Which type of reproduction leads to more genetic variation? Explain why. Use the pictures below as part of your explanation. Do Now Asexual reproduction Sexual reproduction

  3. Meiosis is the process by which the number of chromosomes is reduced by half to form gametes (reproductive cells: sperm & egg in humans and animals or pollen & ovule in plants). This Punnett square shows how alleles separate when sex cells form during meiosis. It also shows the possible allele combinations that can result after fertilization occurs. (READ pages C98-100 in the green Prentice Hall textbook). Meiosis and Punnett Squares

  4. Fertilization is the process that takes place when a male gamete (sperm) and a female gamete (egg) combine to form one new cell. In humans, an egg cell with 23 chromosomes joins a sperm cell with 23 chromosomes to form a new 2n cell with 46 chromosomes. (READ pages C117-119 yellow McDougal book). Fertilization Why does sexual reproduction require meiosis?

  5. As you watch and listen, write in your science notebook some sources of genetic variation (i.e. things that lead to differences in traits and individuals). Source of Genetic Variation: Mutation & Reproduction (Recombination) http://learn.genetics.utah.edu/content/variation/sources/

  6. http://www.biotopics.co.uk/genes1/asexual_and_sexual_reproduction.htmlhttp://www.biotopics.co.uk/genes1/asexual_and_sexual_reproduction.html In your science notebook, READ and take NOTES on the differences between asexual vs. sexual reproduction. Think about how genes (traits) are passed from parent to offspring for each. Also note some examples of each type. Which type of reproduction leads to more genetic variation and why? Genetic Variation: Sexual vs. Asexual Reproduction

  7. McDougall pgs. C102-103 Key Terms Homologous Chromosomes (from father & mother) Sister chromatids (replicated chromosomes) http://www.phschool.com/science/biology_place/labbench/lab3/homologs.html

  8. http://www.phschool.com/science/biology_place/labbench/lab3/homologs.htmlhttp://www.phschool.com/science/biology_place/labbench/lab3/homologs.html http://kids.britannica.com/comptons/art-90111/A-homologous-pair-of-chromosomes-consists-of-one-chromosome-from Homologous Chromosomes (from father & mother) Sister chromatids (replicated chromosomes) Meiosis: process of cell division where DNA is replicated (copied) then separated and divided twice to produce new cells called gametes (reproductive cells) Key Terms

  9. Read McDougall pages C120-121 about Meiosis. Then watch the Meiosis animation detailed on the next slide. Use the two resources to create a labeled diagram showing and describing what happens to the chromosomes in each stage of meiosis. Meiosis

  10. Watch the Meiosis (Narrated) animation and take notes on what happens to the DNA (genes) and chromosomes during each stage of meiosis. Turn on show text to help you take notes. http://www.sumanasinc.com/webcontent/animations/content/meiosis.html Meiosis

  11. On the BACK On the FRONT Definition/characteristics: A trait or characteristic that is developed or learned through life. Traits you aren’t born with. Traits GENERALLY not controlled by DNA. Examples: Walking, speaking English, dyed hair, pierced ears, Glasses, skin cancer? Acquired Trait Genotypes Phenotype Dominant Recessive Gregor Mendel Pea Plants Genetic VariationFertilization Gametes Asexual Reproduction Acquired trait Inherited trait Sexual reproduction Heredity DNA Chromosome Gene Allele Meiosis & Stages Punnett Square Monohybrid cross Homozygous(Purebred) Heterozygous (Hybrid) Mutation Genetic Disorder Sickle Cell Anemia Hemoglobin Pedigree Genetics Vocabulary chart or flashcards due 3/12/14

  12. Choose ONE of the following projects to do as a summative MAJOR assessment for the Genetics Unit. Do detailed, quality work to get full credit. Genetics Projects – due 3/21/14

  13. This evening… • Finish vocabulary. • Test Wednesday over • Traits • Punnett squares • Pedigrees • Meiosis Evening Assignment

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