1 / 17

Mendel’s Work

Mendel’s Work. The Science of Heredity. Genetics- science involving the study of heredity; how traits are passed from one generation to the next. Gregor Mendel ( 1822-1884 ) Father of Genetics. Claim to Fame. Experimented with pea plants ( 34 varieties)

mae
Download Presentation

Mendel’s Work

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Mendel’s Work The Science of Heredity

  2. Genetics- science involving the study of heredity; how traits are passed from one generation to the next Gregor Mendel (1822-1884) Father of Genetics

  3. Claim to Fame • Experimented with pea plants(34 varieties) • Crossed plants with various traits tall, short, blossom color, pod color, pea color, pod texture. • Discovered that the parent plants produced offspring with particular characteristics

  4. Mendel’s Experiments • Offspring were able to produce “recessive” traits that existed in one of the parents that were not expressed visibly in the offspring themselves but were expressed in the next generation • E.G.: Tall plants (from tall x short parents) were able to produce short offspring

  5. Results: Dominant trait always appeared (no mixing/blending of traits) Recessive trait sometimesappeared in the next generation

  6. Traits • Dominant Allele= trait that is expressed when 2 different genes for a trait are present • represented with capital letters Y, T • Recessive Allele= trait which is not expressed when a dominant gene for a trait is present • represented with lower case letters y, t • PGeneration = beginning Parental Generation • F1 Generation = First Filial Generation • F2Generation = Second Filial Generation

  7. Purebred = organism with genes for a particular trait that are alike YY, yy, BB, bb Hybrid = organism with genes for a particular trait that are different Yy, Bb

  8. Punnett Squares • Developed by English geneticist Reginald C. Punnett • What is a Punnett Square? • Chart that shows possible gene combinations in a cross between 2 organisms

  9. Let’s try it!!!

  10. Phenotype and Genotype • Phenotype = physical appearance of an organism • Genotype = its actual genetic makeup (represented with capital and/or lower case letters)

  11. BB & Bb are alike phenotypically (both are black) but different genotypically (genetically)

  12. Homozygous- when 2 genes for a particular trait are the same (TT or tt) • Heterozygous- having 2 different forms of a gene for a particular trait (Tt)

  13. Incomplete Dominance Some genes are neither dominant nor recessive, traits appear to be blended together Examples: 4 o’clock flower, palomino (horse)

  14. Cross between chestnut brown & a white horse = Palomino

More Related