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Download Mendel’s Laws of Heredity-Why we look the way we look
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Mendel’s Laws of Heredity- Why we look the way we look... EQ: What is the significance of Mendel’s experiments to the study of genetics? WHAT IS HEREDITY? The passing on of characteristics (traits) from parents to offspring ● Genetics is the study of biological inheritance and variation in organisms. ● MENDEL USED PEAS... Mendel’s Pea Plants They reproduce sexually through self-pollination ●Have both sex organs with two distinct, male and female, sex cells called gametes ● Fertilization = sperm + egg ● MENDEL CROSSED THEM Cross - combining gametes from parents with different traits ● Line of plants (offspring) became purebred, genetically uniform ● Genes and Alleles Genes - located on chromosomes, they control how an organism develops and looks ●Each organism has two alleles for each trait ● ● Alleles - different forms of the same gene WHAT DID MENDEL FIND? He discovered three laws and rules that explain factors affecting heredity. ● 1. RULE OF DOMINANCE The trait that is observed in the offspring is the dominant trait ● expressed no matter what when present*** ● The trait that disappears in the offspring is the recessive trait ● only expressed when two copies of the allele are present** ● RULE OF DOMINANCE 2. LAW OF SEGREGATION Organisms inherit two copies of each gene, one from each parent. ●The two alleles for a trait must separate when gametes are formed during Meiosis ●A parent randomly passes only one allele for each trait to each offspring ** ● 3. LAW OF INDEPENDENT ASSORTMENT The genes for different traits are inherited independently of each other. ● PHENOTYPE & GENOTYPE Phenotype - the way an organism looks ● ● red hair or brown hair Genotype - the gene combination of an organism ● ● AA or Aa or aa HETEROZYGOUS & HOMOZYGOUS Heterozygous - if the two alleles for a trait are different (Aa) (one dominant & one recessive ) ● Homozygous - if the two alleles for a trait are the same (AA or aa) (both dominant Or both recessive) ●