Transcript Warm Up
Okay – Not really Other Patterns of Heredity Polygenic traits = several genes influence the trait. Examples: Eye color, weight, height, hair color, & skin color. Incomplete dominance Incomplete dominance = a trait that is in between the two parent traits. Ex: Red snapdragon flower crossed with white snapdragon flower results in PINK snapdragon flowers. Co-dominance Co-dominance = Two dominant alleles are expressed at the same time. EX: Homozygous red horse crossed with a homozygous white horse results in Red AND white horse Multiple Alleles Genes with 3 or more alleles are said to have multiple alleles. EX: Blood type in humans (ABO) Blood types Some traits are caused by mutations Sickle cell anemia Recessive genetic disorder. Red blood cells are sickle shaped. Don’t move well through vessels. Possible Genotypes RR = normal red blood cell Rr = slightly curved red blood cell rr = sickle-shaped red blood cell In tropical areas of the world, being heterozygous for sickle cell anemia is not so bad. It provides some immunity to the organism Responsible for malaria. Hemophilia Recessive genetic disorder. Blood cannot clot well. Sex-linked trait. Mostly affects males. What gender has a greater chance of getting hemophilia? Warm Up What are the 4 main blood types? Day 4 Notes Blood Type = Multiple Alleles & Codominance Blood type in humans is controlled by 3 alleles A, B, and O A & B are codominant O is recessive Phenotype Genotype A AA or AO B BB or BO AB AB only O OO only Blood type continued… A-type can only receive A or O blood B-type can only receive B or O blood AB-type can receive A, B, O, AB blood Universal Receiver O-type can only receive O blood Universal Donor Problem 1: Is a type O possible in this situation? Could you please help me? I have a question that is NOT a homework question. I am a Junior in High School. "Could a man with type B blood and a woman with type AB produce a child with type O blood?" I think not, because type O is recessive, and the B's seem to be dominant. My cousin thinks yes. Thank you for your help. IMPOSSIBLE Problem 2: What are the potential blood types of the father of my son? I have been reading your info about inheritance of blood types and I am getting very confused! I am trying to figure out what blood type the father of my son could have since my son and I are both type A. Could you please help? The father could be: A. A, AB, B, or O B. Either A or B C. Either A or O http://nobelprize.org/educational_games/medicine /landsteiner/