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Inheritance Patterns

Inheritance Patterns. Incomplete Dominance. The heterozygous (hybrid) phenotype is somewhere in-between the homozygous phenotypes If R = red and r = white Rr = pink. We still use capital (dominant) and lowercase (recessive) letters And the same letter!. +. Co-Dominance.

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Inheritance Patterns

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  1. Inheritance Patterns

  2. Incomplete Dominance • The heterozygous (hybrid) phenotype is somewhere in-between the homozygous phenotypes • If R = red and r = white • Rr = pink

  3. We still use capital (dominant) and lowercase (recessive) letters • And the same letter!

  4. +

  5. Co-Dominance • Both alleles of a gene are expressed – Equal dominance (like co-workers) • We write alleles as 2 different capital letters • BB = Black feathers • WW = White feathers • BW = Speckled black and white feathers

  6. Black (BB) White (WW) Black & White (BW)

  7. White (WW) Red (RR) Roan (RW)

  8. Multiple Alleles • A gene that is controlled by 3 or more alleles • Blood Groups – ABO • IA :has only antigen A • IB : has antigen B • i: has neither antigens = Type O • IAIB : has both A and B antigens

  9. Blood Transfusions • Recipient – receives blood • Donor – donates blood • You can only receive blood that has the same antigens on its cells

  10. Rh Antigen • Rh antigen is also found on red blood cells • Do not have antigen = Rh negative • Have antigen = Rh positive

  11. Sex-Linked • Females = XX • Males = XY • If a trait is carried on the X chromosome, a male has only 1 copy • It is more likely that a recessive trait will show up on a male than a female. Why?

  12. Polygenic Traits • Many genes are involved in controlling the phenotype

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