1 / 21

27.2 Human Traits

27.2 Human Traits. Survey Complete Dominance Incomplete Dominance X-Linked Traits. Types of Traits. Physical traits : hair, eyes, skin, features, height, weight, shape Psychological traits : personality, shyness, personal skills, social skills

karis
Télécharger la présentation

27.2 Human Traits

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. 27.2 Human Traits Survey Complete Dominance Incomplete Dominance X-Linked Traits

  2. Types of Traits • Physical traits: hair, eyes, skin, features, height, weight, shape • Psychological traits: personality, shyness, personal skills, social skills • Chemical: blood type, predisposition to genetic disorders, diabetes, ect.

  3. Complete Dominance • In a heterozygous genotype, Bb, the dominant allele always appears in the phenotype

  4. Complete Dominance • For example, for one of the gerbil fur color genes, that wild type agouti/brown allele (B) is completely dominant to the black (b) allele of the same gene. Bb gerbils are brown. • And you can't tell by looking at a brown gerbil whether it is BB or Bb, no matter how closely or carefully you look.

  5. Incomplete Dominance • Neither allele is dominant, they are both partially expressed • Blended

  6. Sickle-Cell Anemia • fatal anemia marked by sickle-shaped red blood cells, • Causes pain in the joints, fever, leg ulcers, and jaundice. • Incomplete Dominance • RR’

  7. Sickle-Cell Genes Alleles • R = round red blood cell • R’ = sickle red blood cell Geneotypes • RR = all round blood cells • R’R’ = all sickle blood cells • RR’ = half round and half sickle blood cells

  8. Codominance • Both alleles of a gene pair in a heterozygote are fully expressed, • Neither one being dominant or recessive to the other.

  9. Codominance • Human Blood Types

  10. Inheritance Patterns • AB is codominant • A and B are equal • AO and BO is complete dominance • O is recessive

  11. X-linked Traits • Genes found on the X chromosome, but not the Y • Girls: XrXr or XXr • Boys :XrY • Carrier: mother can carry the allele, but not get the disorder • Carrier: X Xr

  12. X-Linked Disorders • Color blindness • Hemophilia • Duchene Muscular Dystrophy

  13. Color Blindness • Red and green look like gray • C = ability to see colors • c = color blind to red and green • Males are more likely to be colorblind • They only need one recessive gene • XcY males or XcXc females

  14. What numbers do you see ?

More Related