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

8. 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 ’

10. 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

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

13. Codominance Human Blood Types

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

15. X-linked Traits Genes found on the X chromosome, but not the Y Girls: X r X r or XX r Boys :X r Y Carrier: mother can carry the allele, but not get the disorder Carrier: X X r

17. X-Linked Disorders 1.Color blindness 2.Hemophilia 3.Duchene Muscular Dystrophy

19. 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 X c Y males or X c X c females

20. W hat numbers do you see ?