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Present Day Understanding on Heredity based on Mendel’s Findings
Key Concepts: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DNA DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone.  http:// ghr.nlm.nih.gov/handbook/illustrations/dnastructure
 
Chromosomes ,[object Object],[object Object],[object Object],Karyotype: A photomicrograph of an individual's chromosomes arranged in a standard format showing the number, size, and shape of each chromosome type
Homologous chromosomes ,[object Object],[object Object]
Genes - small fragment of DNA in a chromosome where a piece of genetic (hereditary) info is stored -  gene locus  =   place on the chromosome where the gene resides; controls a particular trait e.g. colour, height, etc.
Allele ,[object Object],[object Object],[object Object],Skin Color Height
Genotype   =  the specific combination of alleles;  represented by letters  Phenotype  = what trait looks (acts) like
Pair of homologous chromosomes A gene locus A pair of alleles 3 pairs of alleles Test yourself
Relationship between DNA, Chromosomes and Genes
 
 
C c Fertilization produces heterozygous offspring meiosis II meiosis I (chromosomes duplicated before meiosis) Homozygous dominant parent Homozygous recessive parent gametes gametes Mendel’s Theory  of Segregation C C C C C C C C C C C C C C c c c c c c c c c c c c c c
Lesson Objectives ,[object Object],[object Object],[object Object],[object Object]

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Chapter 19 Heredity Lesson 2 - Present day understanding on heredity based on Mendel’s Experiments

  • 1. Present Day Understanding on Heredity based on Mendel’s Findings
  • 2.
  • 3. DNA DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. http:// ghr.nlm.nih.gov/handbook/illustrations/dnastructure
  • 4.  
  • 5.
  • 6.
  • 7. Genes - small fragment of DNA in a chromosome where a piece of genetic (hereditary) info is stored - gene locus = place on the chromosome where the gene resides; controls a particular trait e.g. colour, height, etc.
  • 8.
  • 9. Genotype = the specific combination of alleles; represented by letters Phenotype = what trait looks (acts) like
  • 10. Pair of homologous chromosomes A gene locus A pair of alleles 3 pairs of alleles Test yourself
  • 11. Relationship between DNA, Chromosomes and Genes
  • 12.  
  • 13.  
  • 14. C c Fertilization produces heterozygous offspring meiosis II meiosis I (chromosomes duplicated before meiosis) Homozygous dominant parent Homozygous recessive parent gametes gametes Mendel’s Theory of Segregation C C C C C C C C C C C C C C c c c c c c c c c c c c c c
  • 15.