Name two pea plant traits studied by Gregor Mendel.Define "phenotype".

1. Define "genotype".
3. Why would a pea plant that is hetereozygous for plant height have the dominant phenotype? (If having trouble answering this, you may want to make sure you know what "heterozygous" means, and that should help!)
4. A pea plant with the recessive phenotype for plant height would have which of the following genotypes? (a) TT (b) tt (c) Tt (d) TT or Tt
5. What is the difference between a "Mendelian" trait and a "polygenic" trait?
6. Why are females more likely to be carriers for color blindness than to be color blind themselves?
7. Which of the following is a polygenic trait in humans? (a) Hitchhiker's Thumb (b) Earlobe attachment (c) Skin color (d) Freckles
8. In the ABO blood group system, what is/are the possible genotype(s) for a person who has blood type "A"?
9. In the ABO blood group system, what is/are the possible genotype(s) for a person who has blood type "O"?