Incomplete codominance multiple_alleles

15,269 views

Published on

Published in: Lifestyle, Business
0 Comments
7 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
15,269
On SlideShare
0
From Embeds
0
Number of Embeds
1,072
Actions
Shares
0
Downloads
519
Comments
0
Likes
7
Embeds 0
No embeds

No notes for slide
  • Option 2
  • Incomplete codominance multiple_alleles

    1. 1. Incomplete Dominance, Codominance and Multiple Alleles
    2. 2. INCOMPLETE DOMINANCE <ul><li>Incomplete Dominance- Pattern of gene expression in which the phenotype of a heterozygous individual is intermediate between those of the parents. </li></ul><ul><li>Cases in which one allele is not completely dominant over another. </li></ul><ul><li>Example: Snapdragons and Carnations </li></ul>
    3. 3. Incomplete Dominance- F 1 generation
    4. 4. Incomplete Dominance- F 2 generation
    5. 6. CODOMINANCE <ul><li>Codominance - The condition in which both alleles in a heterozygous organism are expressed. </li></ul><ul><li>BOTH alleles contribute to the phenotype. </li></ul><ul><li>The two alleles don’t blend , but are rather both present in the offspring. </li></ul><ul><li>Examples- Checkered Chickens, Roan Horses, Roan Cows, Variegated Clover. </li></ul>
    6. 7. B B W W BW BW BW BW Codominance White chicken Black chicken Checkered Checkered Checkered Checkered Checkered Black White
    7. 8. http://search.vadlo.com/b/q?rel=2&keys=Dominance+Incomplete+Dominance+Codominance+PPT Roan Horse
    8. 9. Roan Cattle Variegated Clover http://3.bp.blogspot.com/_zUPrgMM5tUg/SSVdrs59_uI/AAAAAAAAAA8/qJGjG2nZPhk/s200/codominance.GIF http://www.ccs.k12.in.us/chsteachers/BYost/Biology%20Notes/CH11notescoincompletedom_files/image004.jpg
    9. 10. Multiple Alleles <ul><li>Multiple Alleles- Genes which have more than two alleles. </li></ul><ul><li>It is common for more than 2 alleles to control a trait in a population </li></ul><ul><li>Multiple alleles can only be studied in populations since each individual only has 2 alleles for a trait. </li></ul><ul><li>Examples: human blood types, fruit fly eye color, c oat color in rabbits: C , cch , ch , and c . </li></ul>
    10. 11. Complex Inheritance and Human Heredity Coat Color of Rabbits Light gray Dark gray Himalayan Albino Chinchilla 11.2 Complex Patterns of Inheritance Chapter 11
    11. 12. ABO Blood Type <ul><li>ABO blood type in humans is determined by three alleles: </li></ul><ul><li>I A I B i </li></ul><ul><li>I A and I B are codominant alleles. </li></ul><ul><li>Both I A and I B are dominant to the allele i. </li></ul>Genotype Blood Type I A I A A I A i A I B I B B I B i B I A I B AB ii O
    12. 13. Complex Inheritance and Human Heredity Multiple Alleles <ul><li>Blood groups in humans </li></ul><ul><li>ABO blood groups have three forms of alleles. </li></ul>11.2 Complex Patterns of Inheritance Chapter 11
    13. 14. Donor-recipient compatibility <ul><li>Note: </li></ul><ul><li>Type O blood may be transfused into all the other types = the universal donor . </li></ul><ul><li>Type AB blood can receive blood from all the other blood types = the universal recipient . </li></ul>© 2007 Paul Billiet ODWS O AB B Donor A O AB B A Type Recipient = Safe transfusion = Unsafe transfusion

    ×