1 / 25

Introduction to Genetics

Introduction to Genetics. Abbott Gregor Mendel. The “Father of Genetics” 1822-1884 As you watch this video clip write down 3 facts about Gregor Mendel. https://www.youtube.com/watch?v=YxKFdQo10rE. https://www.youtube.com/watch?v=0vAAf4g5iF8. 3 Main Principles. 1) Segregation.

bburch
Télécharger la présentation

Introduction to Genetics

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. Introduction to Genetics

  2. Abbott Gregor Mendel • The “Father of Genetics” 1822-1884 • As you watch this video clip write down 3 facts about Gregor Mendel https://www.youtube.com/watch?v=YxKFdQo10rE https://www.youtube.com/watch?v=0vAAf4g5iF8

  3. 3 Main Principles

  4. 1) Segregation • Alleles are separated during reproduction; one from each parent. • Ex. BB (mom) bb (dad) • Child (Bb)

  5. Segregation • Alleles are separated during reproduction; one from each parent.

  6. 2) Dominance • In an heterozygous situation of alleles (Aa for example), one trait will be dominant (show up) over the other. • Ex. B= Brown eyes b= blue eyes • BB= Brown eyes bb= blue eyes • Bb= Brown eyes

  7. 3) Independent Assortment • Which allele an organism receives has no effect on other traits which may be displayed. • Ex. Hair color has no effect on Brain size.

  8. So- What is Genetics? • The study of the path of characteristics…ie where they came from, where they are and where they may go...

  9. Why study genetics? • Because genetics determine WHO WE ARE !!!

  10. Alleles • The different forms of a gene • A, B, Z (anything!)

  11. Homozygous -Purebred • Two alleles of the same dominance (either both AA or both aa)

  12. Heterozygous-Hybrid • Two letters (alleles) that are different = hetero • Ex. Aa or Zz or Bb.

  13. Dominant /Recessive • Dominant is represented as an UPPER CASE Ex. A • Recessive is represented as lower case. Ex. a

  14. Phenotype • The physical traits that a person actually shows!

  15. Genotype • The genes that a person carries but does not show. • Ex. A person may carry a trait for blue eyes but actually have Brown eyes!

  16. Class survey • Question- Are dominant traits seen more often than recessive traits?

  17. Free earlobes/Attached earlobes

  18. Widows Peak/No widows peak

  19. Cleft chin

  20. Smile dimples

  21. Two Factor Crosses

  22. Incomplete Dominance • A situation where one trait is not completely dominant over the other. The heterozygous trait is in between the homozygous phenotypes.

  23. Codominance • A situation in which both alleles contribute to the phenotype of the organism.

  24. Multiple alleles • Genes that have more than two alleles.

  25. Polygenic Traits • Genetic traits that are a combination of several genes.

More Related