1 / 90

lethals

lethals. genes which cause death of the organism. pleiotropy. Single gene affects many traits, even seemingly unrelated ones. epistasis. One non-allelic gene pair masks another -- from Greek, “standing upon” (much like dominance). collaboration.

geralynm
Download Presentation

lethals

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. lethals • genes which cause death of the organism

  2. pleiotropy • Single gene affects many traits, even seemingly unrelated ones

  3. epistasis • One non-allelic gene pair masks another -- from Greek, “standing upon” (much like dominance)

  4. collaboration • Two non-allelie gene pairs produce novel phenotype (much like incomplete dominance)

  5. Polygenic traits • 2+ non-allelic gene pairs that control a single trait

  6. penetrance • % individuals who show phenotype expected from genotype

  7. expressivity • degree to which a particular gene is expressed in an individual

  8. Effects of the environment • environment affects gene expression • environmentally-produced phenotype which mimics genotype = phenocopy

  9. Linkage • Lack of independent assortment of genes due to location on the same chromosome

  10. Recombination • Breaks in linkage and transmission of new gene combinations on a single chromosome after prophase I crossovers

  11. Mapping • Using crossover frequencies as relative map units – allows construction of “maps” of gene locations

  12. Karyotype

  13. Causes of Genetic Diseases*aneuploidies from nondisjunctions

  14. Down’s syndrome

More Related