Codominance : Human Blood

Codominance is the situation when the effect of both genes are observed. This presentation describes how codominant traits work to determine human blood types and flower coloring .

1. Biology – Let’s Simplify

2. CO DOMINANCE Codominance – “Co” means together. In Heterozygous both alleles show their effects equally. Alleles do not show blended Phenotype. In codominance , the “recessive” & “ dominant” traits appear together in phenotype of hybrid organisms.

3. CODOMINANCE IN HUMANS (HUMAN BLOOD) (I A = I B ) i Blood Type Alleles I A = type A Antigen I B = type B Antigen I A I B = type A & B Antigen I O or i = No Antigen

4. AB

5. ABO BLOOD TYPE Q – Complete a cross with a father & mother that both have type AB blood. What % of their offspring could receive each blood group? AB = I A I B I A I B I A I B I A I B I A I B I A I A I A I B I A I B I B I B A = 25% B = 25% AB = 50% O = 0%

6. CODOMINANCE SICKLE CELL ANEMIA O2 deficiency Substitution of T by A Clotting

7. CODOMINANCE IN PLANTS RR Red Camellia WW White Camellia W W R R RW RW RW RW Gametes F1- RW All White flowers with Pink spots. Same Phenotype & Genotype

8. CODOMINANCE IN ANIMALS BB WW B B W W B W B W B W B W White Cow Brown Cow F1-BW All Roan Cows White cows with Brown spots Gametes