halcyon-( hal ‘se on)- (adjective)- very happy and successful

1. halcyon-(hal ‘se on)- (adjective)- very happy and successful During those early halcyon years, the company’s potential for growth seemed unlimited. In unicorns, a shiny horn is dominant. Cross a female heterozygous, shiny horn, unicorn with a male that has a dull horn. What is the genotypic ratio?

2. Male Gametes Female Gametes Percentages: Genotypic Ratio: Phenotypic Ratio:

3. Vocabulary Review • Genotype- the genetic make-up of an organisms • Phenotype- the physical appearance of an organisms • Homozygous- two of the same alleles • Heterozygous- two different alleles

4. Dihybrid Crosses

5. If the male genotype is BbTt what are the possible gametes he will contribute?

6. What are the possible gametes for a genotype BBtt?

7. What are the possible gametes for a genotype bbTt?

8. Male Gametes Female Gametes

9. In Loo-Loo Birds, long wings (L) are dominant to short wings (l) and big eyes (B) are dominant to small eyes (b). Draw the punnett square for the following cross: LlBB x llBb

10. In unicorns, a Rainbow mane and tail (R) is dominant to a brown mane and tail (r) and Glitter coat (G) is dominant to a white coat (g). What is the phenotypic ratio produced by crossing two individuals who are both heterozygous for these two traits?

11. What is the probability of an offspring showing both dominant traits in the following cross where Dark hair (D) and Bright fingernails (B) are dominant?DdBb x ddbb

12. A florist crosses flowers with a pleasant fragrance (P) dominant to no fragrance (p) and a magenta color (M) dominant to a white color (m). What is the probability that these two individuals will be magenta with a pleasant fragrance?ppmm x PPMm

13. Exit Ticket (assessment grade): On a separate sheet of paper complete the following: • Give an example of a homozygous genotype • Give an example of a heterozygous geneotype • What is the difference between phenotype and genotype? • Complete a punnett square for a cross between Tt and Tt. Give me genotypic and phenotypic ratios, then express those ratios in percentages

14. Decoding Pedigrees

15. Uses of pedigrees • genetic therapy • tracking of a trait through a family tree.

16. Pedigree Best Practices • a pedigree can study only one trait at a time • the trait must be visible • the trait must be controlled by one gene (it cannot be polygenic)

17. Pedigree Symbols

18. Pedigree #1

19. Pedigree #1

20. Pedigree #1

21. Pedigree #1 • Characteristics of a dominant pedigree: 1) Every affected individual has at least one affected parent 2) Affected individuals who mate with unaffected individuals have a 50% chance of transmitting the trait to each child; and 3) Two affected individuals may have unaffected children.

22. Pedigree #2

23. Pedigree #2

24. Pedigree #2

25. Pedigree #2 • Characteristics of recessive pedigrees: 1) An individual who is affected may have parents who are not affected 2) All the children of two affected individuals are affected 3) In pedigrees involving rare traits, the unaffected parents of an affected individual may be related to each other.

26. Pedigree #3

27. Pedigree #3

28. Pedigree #3

29. Pedigree #3 • Characteristics of sex-linked pedigrees • All females from the affected male have the trait, but not all males from affected females (dominant) • All males from the affected female have the trait, but not all females from affected males (recessive)