1. Genetics- 4.3.12,10.3.1,10. 3.2 David Barkley Taylor Turner

2. Polygenic Inheritance  Polygenic inheritance is the inheritance of a characteristic that is controlled by more than one gene.  Human traits that show continuous variation include weight, height and skin color.

3. Polygenic Inheritance  This means that something simple, like skin color, is affected by more than one gene from ones parents. Each allele of a polygenic character will offer a little bit of information to the whole phenotype.

4. Polygenic Inheritance  Human skin color is a good example to visually see how more than one gene can affect appearance.

5. Polygenic Inheritance  In humans there are at least three genes coding for skin color. Each skin color gene has two forms; one form codes for high levels of melanin production, and the other form codes for low levels of melanin production

6. Polygenic Inheritance  Wheat  Kernel color in wheat is determined by two gene pairs  crossing individuals with the phenotype extremes yield offspring that are a 'blend' of the two parents

7. Polygenic Inheritance  When these homozygotes are crossed the offspring are all double heterozygotes AaBb  two double heterozygotes are crossed- http://staff.jccc.net/pdecell/evolution/pol ygen.html http://staff.jccc.net/pdecell/evolution/pol ygen.html

8. 4.3.12 Deduce the genotypes and phenotypes of individuals in pedigree charts.

9. Pedigrees:  Are used to illustrate the mode of inheritance (dominant or recessive)  Give clues to the mode of inheritance of the disease  Show potential threat to other family members

10. Phenotypes:  Observable and measurable charaterics in an organisms  Effects of genetic coding and environment Ex: eye color

11. Genotypes:  Genetic composition of organisms  With respect to the specific traits they describe  Refers specifically to genetic code (environment has no effect)

12. Type of Inheritance

13. Autosomal Dominant Inheritance  Requires only one parent to carry the dominant gene in order for children to be affected.

14. Autosomal Recessive Inheritance  Requires for both parents must carry the recessive gene for offspring to be affected.

15. X-Linked Dominant & Recessive Inheritance  More common in boys because they only need one gene  A mother gives the dominant or recessive gene male offspring and the father gives the Y chromosome.

16. Pedigree Vs. Punnett Square  A punnett square is used to determine the out come of two alleles being crossed  Contrarily a pedigree is used to find modes of inheritance for genetic diseases

17. Extra Pedigree Practice  www.zerobio.com/drag_gr11/ pedigree / p edigree _overview.htm www.zerobio.com/drag_gr11/ pedigree / p edigree _overview.htm

18. I’M MY OWN GRANDPA

19. Works Cited  " 10.3.2 Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin color.." ARHicks — Just another Edublogs.org weblog. N.p., n.d. Web. 9 Feb. 2012..  "Define polygenic inheritance - IB Biology Syllabus." IB Biology Syllabus Home - IB Biology Syllabus. N.p., n.d. Web. 9 Feb. 2012..  "Explain that polygenic inheritance can contribute to continuous variation - IB Biology Syllabus." IB Biology Syllabus Home - IB Biology Syllabus. N.p., n.d. Web. 9 Feb. 2012..  "Gene Interactions." Estrella Mountain Community College. N.p., n.d. Web. 9 Feb. 2012..  "Genetic engineering and biotechnology." IB Guides. N.p., n.d. Web. 12 Feb. 2009..  "IB Biology Syllabus." Biology for Life. N.p., n.d. Web. 9 Feb. 2012..  "Polygenic inheritance." JCCC Staff and Faculty Pages. N.p., n.d. Web. 13 Feb. 2012..