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Wednesday October 28, 2009

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Wednesday October 28, 2009

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    1. Wednesday October 28, 2009 Take out your worksheet packet? compare your answers to worksheet 4 with your neighbor Are the flowers ? an example of .? A. Co-Dominance B. Incomplete Dominance C. Di-Hybrid Crosses

    2. Agenda Wednesday 10-28-09 Todays Topic: Sex-Linked traits & Pedigrees Homework for Friday 10/30/09: Complete Worksheet 3 Wear an awesome Halloween costume! - Edit the enzyme lab

    3. SEX-LINKED TRAITS & PEDIGREES

    4. SEX DETERMINATION XX =

    5. Who decides? Mom can give X Dad can give X or y

    6. SEX CHROMOSOMES CONTAIN GENES THAT CODE FOR TRAITS =

    7. SEX LINKED TRAITS show up in different % in males and females because they move with the sex chromosomes

    8. Only Males Inherit Y Chromosomes (No Hairy Pinnas for us women!) Y-LINKED GENES: Genes carried on Y chromosome

    9. Both Males and Females Inherit X Chromosomes: Males XY; Females XX X-LINKED GENES: Genes carried on the X chromosome

    10. Make a cross with an X-linked gene

    11. Mother Without hemophilia = X X Without hemophilia = X X With hemophilia = X X Father Without hemophilia = X y With hemophilia = X y

    12. Make a cross with an X-linked gene

    14. Worksheet 3 #3 Color Blindness is X-linked Recessive! N= normal n= color blind Lets try a color-blind test!!

    16. PEDIGREES A chart illustrating family histories of traits Biologists will look at patterns of inheritance Predictable patterns from one generation to the next

    17. Pedigree Charts

    19. Worksheet 3 Part C

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