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Mendel’s Laws of Heredity

Mendel’s Laws of Heredity. Why we look the way we look. What is heredity ?. The passing on of characteristics (traits) from parents to offspring Genetics is the study of heredity. Mendel used peas. They reproduce sexually

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Mendel’s Laws of Heredity

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  1. Mendel’s Laws of Heredity Why we look the way we look...

  2. What is heredity? • The passing on of characteristics (traits) from parents to offspring • Genetics is the study of heredity

  3. Mendel used peas... • They reproduce sexually • They have two distinct, male and female, sex cells called gametes • Their traits are easy to isolate

  4. Mendel crossed them • Fertilization - the uniting of male and female gametes • Cross - combining gametes from parents with different traits

  5. What Did Mendel Find? • He discovered different laws and rules that explain factors affecting heredity.

  6. 1. Rule of Unit Factors • Each organism has two alleles for each trait • Alleles - different forms of the same gene • Genes - located on chromosomes, they control how an organism develops

  7. 2. Rule of Dominance • The trait that is observed in the offspring is the dominant trait (uppercase) • The trait that disappears in the offspring is the recessive trait (lowercase)

  8. 3. Law of Segregation • The two alleles for a trait must separate when gametes are formed • A parent randomly passesonly oneallele for each trait to each offspring

  9. 4. Law of Independent Assortment • The genes for different traits are inherited independently of each other.

  10. 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

  11. Heterozygous & Homozygous • Heterozygous - if the two alleles for a trait are different (Aa) • Homozygous - if the two alleles for a trait are the same (AA or aa)

  12. Dihybrid vs Monohybrid • Dihybrid Cross - crossing parents who differ in two traits (AAEE with aaee) • Monohybrid Cross - crossing parents who differ in only one trait (AA with aa)

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