1 / 12

Unit 3- Genetic Processes

Unit 3- Genetic Processes. 5.7 Multi-trait inheritance. Dihybrid cross. http://rushartsbiology.wikispaces.com/Visuals+-+Unit+6. Dihybrid cross is a cross that involves two traits. Law of independent assortment. Alleles of two genes separate independently during gamete formation.

abdalla
Download Presentation

Unit 3- Genetic Processes

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. Unit 3- Genetic Processes 5.7 Multi-trait inheritance

  2. Dihybrid cross http://rushartsbiology.wikispaces.com/Visuals+-+Unit+6 • Dihybrid cross is a cross that involves two traits

  3. Law of independent assortment • Alleles of two genes separate independently during gamete formation http://www.mun.ca/biology/desmid/brian/BIOL2060/BIOL2060-20/CB20.html

  4. Mendel`s Experiments: F1 generation • To create F1 generation, Mendel crossed two true-breeding parent plants (genotypes PPRR and pprr) PR PR pr pr

  5. Mendel`s Experiments: F2 generation • To form F2, he crossed two offspring from F1 (PpRr x PpRr) • Results showed that alleles assorted themselves independently PR Pr pR pr PR Pr pR pr P

  6. Product Law • Genetic ratios based on probability • Product law: probability of two random events occurring=product of individual probabilities • Thus, the chance of having a girl 3 times in a row is 0.5 x 0.5 x 0.5=12.5%

  7. Discontinuous vs. Continuous variation • Discontinuous variation occurs when expression of products of one gene has no impact on expression of products of second gene. • Continuous variation occurs when product of one gene is affected by product of another gene. http://scienceaid.co.uk/biology/genetics/variation.html

  8. Additive allele • Combined effects of alleles at different loci are equal to sum of individual effects • Ex. Skin colour, height, hair colour and eye colour

  9. Dihybrid cross to work on as a class See # 3 on p. 214. We will do this question on the board as a class.

  10. Blood types: Rh factor • Rh factor alleles (Rh+, Rh-) inherited independently of ABO alleles • Rh positive individual: Rh+/Rh- or Rh+/Rh+ • Rh negative individual: Rh-/Rh-

  11. Rh factor question from text • See p. 214 #7

  12. Continuous vs Discontinuous Variation Question • P. 214 # 6

More Related