(Microsoft PowerPoint - Mendel\222s Genetics) - Jefferson County ...

2/5/2013Mendel’s 4 genetic Hypothesizes Recessive—”weaker gene” The gene that would be “covered up” in thePresence of another Dominant Gene.Mendel’s 4 genetic Hypothesizes To have a recessive characteristic, such asBlonde hair, both of the 2 genes for haircolor MUST be the recessive Blonde Hairgenes.Mendel’s 4 genetic Hypothesizes 4. Principle of Segregation A. all characteristics have2 genes/alleles each. B. When Haploid Cells are created, each of these 2genes for all the characteristics of an organism areSegregated (separated) into their own HaploidCell—making Haploid cells with only 1 gene percharacteristic.Mendel’s 4 genetic Hypothesizes C. during Cell Fertilization(union between asperm/pollen cell andan unfertilized egg/seedcell) Each single,Haploid cell’s allelesare combined to makethe 2 alleles percharacteristic neededto express the trait.Mendel’s 4 genetic Hypothesizes When 2 different Haploid Cells combine, it makesa Fertilized Egg Cell or Zygote with 2 Alleles pertrait. Dominant andRecessive Gene ruleswill then determine theactual appearance ofthe organism.Phenotype vs Genotype--a Phenotype is the Observable APPEARANCE ofan organism’s genetic make-up determined by thetype of alleles the traits have (Homozygous-Recessive, or Dominant-Heterozygous)Ex; height, coloring, size,shape, ect4