genetics- 4.3.12,10.3.1,10. 3.2 david barkley taylor turner
DESCRIPTION
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.TRANSCRIPT
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Genetics-4.3.12,10.3.1,10.3.2David BarkleyTaylor Turner
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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.
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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.
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Polygenic Inheritance Human skin color is a good example to
visually see how more than one gene can affect appearance.
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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
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Polygenic InheritanceWheatKernel color in wheat is
determined by two gene pairscrossing individuals with the
phenotype extremes yield offspring that are a 'blend' of the two parents
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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/polygen.html
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4.3.12 Deduce the genotypes
and phenotypes of individuals in
pedigree charts.
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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
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Phenotypes: Observable and measurable charaterics
in an organisms Effects of genetic coding and
environment Ex:
eye color
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Genotypes: Genetic composition of organisms With respect to the specific traits they describe Refers specifically to genetic code (environment
has no effect)
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Type of Inheritance
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Autosomal Dominant Inheritance Requires only one parent to
carry the dominant gene in order for children to be affected.
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Autosomal Recessive Inheritance
Requires for both parents must carry the recessive gene for offspring to be affected.
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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.
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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
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Extra Pedigree Practice www.zerobio.com/drag_gr11/pedigree/pedigree_overview.htm
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I’M MY OWN GRANDPA
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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. <http://arhicks.edublogs.org/2011/06/07/10-3-2-explain-that-polygenic-inheritance-can-contribute-to-continuous-variation-using-two-examples-one-of-which-must-be-human-skin-color/>.
"Define polygenic inheritance - IB Biology Syllabus." IB Biology Syllabus Home - IB Biology Syllabus. N.p., n.d. Web. 9 Feb. 2012. <http://ibbiology.wetpaint.com/page/Define+polygenic+inheritance>.
"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. <http://ibbiology.wetpaint.com/page/Explain+that+polygenic+inheritance+can+contribute+to+continuous+variation>.
"Gene Interactions." Estrella Mountain Community College. N.p., n.d. Web. 9 Feb. 2012. <http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookgeninteract.html>.
"Genetic engineering and biotechnology." IB Guides. N.p., n.d. Web. 12 Feb. 2009. <www.ibguides.com/biology/notes/genetic-engineering-and-biotechnology>.
"IB Biology Syllabus." Biology for Life. N.p., n.d. Web. 9 Feb. 2012. <http://www.biologyforlife.com/course%20info/Syllabus/Syllabus.htm#Topic_10:__HL_Genetics>.
"Polygenic inheritance." JCCC Staff and Faculty Pages. N.p., n.d. Web. 13 Feb. 2012. <http://staff.jccc.net/pdecell/evolution/polygen.html>.