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TOPIC : Genetics Aim: Describe how to use punnett squares. Do Now : next slide

TOPIC : Genetics Aim: Describe how to use punnett squares. Do Now : next slide HW : Study for tomorrow’s Reproduction test! BRING YOUR TEXTBOOK TO CLASS! Pedigree Chart Reading notes due Wednesday! Genetic Engineering Reading notes due Thursday!. B - Style.

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TOPIC : Genetics Aim: Describe how to use punnett squares. Do Now : next slide

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  1. TOPIC: Genetics Aim: Describe how to use punnett squares. Do Now: next slide HW: Study for tomorrow’s Reproduction test! BRING YOUR TEXTBOOK TO CLASS! Pedigree Chart Reading notes due Wednesday! Genetic Engineering Reading notes due Thursday!

  2. B - Style Identify each structure described. • Where pollen tube forms • Produces pollen • Where pollination occurs • Will turn into fruit • Where fertilization occurs • Will turn into seeds F - Anther A - Stigma D - Ovary C - Ovule C - Ovule

  3. Embryo Seed coat Cotyledon

  4. The trait for height in pea plants can be represented by using the letter “T.” T represents the allele for tall and t represents the allele for short. • What do we call the genotype for TT? b. What is the phenotype for TT? c. What do we call the genotype for tt? d. What is the phenotype for tt? e. What do we call the genotype for Tt? f. What is the phenotype for Tt? Homozygous dominant Tall Homozygous recessive short Heterozygous tall

  5. The trait for seed color in pea plants can be represented by using the letter “G.” G represents the allele for green seeds and g represents the allele for yellow seeds. • What do we call the genotype for gg? b. What is the phenotype for gg? c. What do we call the genotype for Gg? d. What is the phenotype for Gg? e. What do we call the genotype for GG? f. What is the phenotype for GG? Homozygous recessive yellow Heterozygous green Homozygous dominant green

  6. Probability • The possibility that an event may or may not happen

  7. Punnett Square • Shows possible gene combinations of offspring bw 2 organisms

  8. T T Example: 1. T = tall t = short TT x tt t t T t T T t t T t

  9. T T T t t T t t T t T t Phenotype= • 100% tall Genotype= 100% heterozygous

  10. B b Example #2: B = Black fur b = white fur Bb x Bb B B B B b b B b b b

  11. B b B b B B B b B b b b Phenotype= 75% black, 25 % white Genotype= 25% homozygous dominant 25% homozygous recessive 50% heterozygous

  12. Example #3: Red is dominant in flowers & white is recessive. Cross a heterozygous flower with a homozygous dominant flower. • R = redr = white • Rr x RR

  13. Rr x RR R r Phenotype= 100% red R r R R R Genotype = R R R R r 50% homozygous dominant 50% heterozygous

  14. TOPIC: Genetics Aim: Practice using punnett squares. Do Now: next slide HW: Pedigree Chart Reading notes due Monday. Study for Tuesday’s Reproduction test.

  15. One dog carries the heterozygous, black fur trait and the other carries homozygous recessive white traits. What are the chances of having a puppy with black fur? B = black, b = white Bb x bb

  16. B b Bb x bb b b b B b Answer: 50% chance of having a puppy with black fur b B b b b

  17. The phenotype of an organism • represents its genetic composition • reflects all the traits that are actually expressed • occurs only in dominant pure organisms • cannot be seen

  18. If an individual possesses two recessive alleles for the same trait, the individual is said to be • homozygous for the trait             • haploid for the trait • heterozygous for the trait           • mutated

  19. The cell in Diagram 1 contains 4 chromosomes and is undergoing the process of mitosis. What is the total number of chromosomes in each individual cell in Diagram 3? 1. 8 2. 2 3. 16 4. 4

  20. In humans, which cell is produced by mitosis (mitotic cell division)? • sperm cell • skin cell • egg cell • zygote cell

  21. What would result if mitosis was not followed by division of the cytoplasm? • two cells, each with one nucleus • two cells, each without a nucleus • one cell with two identical nuclei • one cell without a nucleus

  22. The diagram can be used to show a process of: • making new body cells for repair of tissue • making new sex cells • meiosis • sexual reproduction

  23. The pistil of the flower includes the • stigma, anther, and filament • stamen, stigma and anther • stigma, style, and ovary • petals, sepals and pollen grains

  24. Identify the process represented in the diagram. • Where does this occur? • Describe what happens to the chromosome number. • Compare the daughter cells to each other. Meiosis Gonads Splits in half Not genetically similar to each other

  25. The blockages shown at A and B would most likely interfere with the ability to • transport gametes • produce mature gametes • eliminate waste products through the urethra • express secondary sex characteristics

  26. Which statement is true of both mitosis and meiosis? • Both are involved in asexual reproduction. • Both occur only in reproductive cells. • The number of chromosomes is reduced by half. • DNA replication occurs before the division of the nucleus.

  27. Which statement about the gametes represented in the diagram below is correct? • They are produced by females. • They are fertilized in an ovary. • They transport genetic material. • They are produced by mitosis.

  28. The process of meiosis formed • cell 1, only • cells 1 and 2 • cell 3, only • cells 2 and 3

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