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1. If Cabs baseball is dominant over Falcons baseball: (B & b)

BW HAVE SLATE, MARKER & ERASER ON DESK, & separate sheet of paper Must Work QUICKLY & STAY ON TASK!. 1. If Cabs baseball is dominant over Falcons baseball: (B & b) a. Write the genotype for a heterozygous father. b. Write the genotype for a homozygous recessive mother.

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1. If Cabs baseball is dominant over Falcons baseball: (B & b)

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  1. BW HAVE SLATE, MARKER & ERASER ON DESK, & separate sheet of paper Must Work QUICKLY & STAY ON TASK! 1. If Cabs baseball is dominant over Falcons baseball: (B & b) a. Write the genotype for a heterozygous father. b. Write the genotype for a homozygous recessive mother. c. Draw a punnett square to show the possibilities for their offspring. d. What are the genotype frequencies for offspring? (use vocab) e. What are the phenotype frequencies? ***Review your genetics notes when finished

  2. BW Answers A. Bb (heterozygous) B. bb (homozygous recessive) C. (Punnett Square) D. 50% homozygous recessive 50% heterozygous E. 50% Falcons 50% Cabs

  3. This week: Wednesday: Punnet square practice, Codominance, Incomplete dominance worksheest Thursday: Review genetics, quiz on VOCAB Friday: Genetic Disease brochure due All genetic worksheets due (binder check) *I will have your notebooks graded over the weekend- sorry it has been a MONTH! 

  4. Gregor Mendel (1822- 1884) “FATHER OF GENETICS” -experiments with pea plants led to understanding of dominant vs recessive -experiments unappreciated during his time, died in 1884 due to kidney failure

  5. Do all organisms follow Mendel’s Law Of Dominance? • How does skin color work in humans? What about height?

  6. Codominance What does the prefix “co” mean? (hint: Coworkers, Cooperation, Co-captains…)

  7. Codominance: • In heterozygous genotypes, both of the alleles are expressed TOGETHER in the phenotype. • Uses only capital letters REDxWHITE = RED&WHITE

  8. What is the genotype for a black cow? • BB • What is the genotype for a white cow? • WW • What is the genotype for a black AND white cow?? • BW

  9. P= BBX WW (do the Punnett square) F1= 100% BW

  10. Blood Types

  11. 3 Blood Type Rules- write on SIDE of blood type handout

  12. Rule 1 • Both A and B alleles are dominant over o. • So, individuals who have an Aogenotype will have an A phenotype.

  13. Rule 2 • The A and B alleles are codominant.  • Therefore, if an A is inherited from one parent and a B from the other, the phenotype will be AB.

  14. Rule: 3 • People who are type O have oogenotypes.  • In other words, they inherited a recessive o allele from both parents.

  15. Practice • What are the phenotypes of the following genotypes? • AA • Type A • Bo • Type B (o is recessive) • Homozygous recessive • Type O • AB • Type AB (codominant)

  16. Punnett Square • You perform blood crosses just the same way as you would any other Punnet Square. • Example: AoMom and a Bo Dad Show by vote of fingers, how many offspring genotypes are possible? 4 = (Ao, Bo, AB, oo)

  17. blood type worksheet ? ? ? ? ? They did a Punnett Square for all potential crosses: AA x oo AND Ao x oo

  18. Guided practice ? ? ? ? ? Show your work (in notebook) for all potential crosses: AA x BB Ao x BB AA x Bo Ao x Bo

  19. Continue the blood type practice problems (do punnets in notebook)

  20. Answer Key

  21. What do you think “incomplete” dominance looks like? Incomplete Dominance

  22. Incomplete dominance • In the heterozygous genotype, the alleles are BLENDED in the phenotype • Uses only capital letters Red flowerx white flower = Pink flower

  23. Slate practice… • BB = blue • YY = yellow • BY = green Do a Punnett Square cross between 2 green flowers What would be the genotype of GREEN flowers? (green is a color that is “inbetween” yellow and blue)

  24. Incomplete dominance Practice with the spongebob worksheet. Both handouts due Friday. Turn in early for extra credit.

  25. Heterochromiairidis • chimerism, where two or more genotypes arise from the fusion of more than one fertilizedzygote in the early stages of embryonic development. • In genetics, a mosaic or mosaicism denotes the presence of two or more populations of cells with different genotypes in one individual who has developed from a single fertilized egg

  26. Closure Do a Venn Diagram with the similarities and differences between codominance & incomplete dominance

  27. https://www.wnyc.org/radio/#/ondemand/91597 • RadioLab (5:26-14:00)

  28. Vocab Quiz A. Genotype with 2 different alleles (Bb) B. The allele that is ALWAYS expressed in the phenotype, even if only one is present C. The alleles that a person has, their genetic makeup D. The allele that is ONLY expressed in the phenotype if both are the same E. A pair of chromosomes that has genes for the same TRAITS, but may have different alleles F. A chart that predicts allele combinations G. The physical appearance of an organism H. A genotype with two of the same alleles (BB or bb) I. The study of heredity (inheritance) J. A version of a gene 1. Allele 2. Genotype 3. Heterozygous 4. Homologous Chromosomes 5. Phenotype 6. Recessive 7. Dominant 8. Punnett Square 9. Homozygous 10. Genetics

  29. Trade & Grade 1. J 2. C 3. A 4. E 5. G 6. D 7. B 8. F 9. H 10. I

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