Blood type in humans is an example of trait that has multiple alleles. the alleles for type a blood and type b blood are codominant, and type o blood is recessive to both type a and type b. if a girl with type ab blood has a brother with type o blood and a sister with type b blood, which of the following genotypes could it be possible for their parents to have?

ao and bo

ab and oo

ab and bo

ao and ab

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4

Brian made this table to organize his notes on changes of state change of state energy change melting gain freezing lose deposition gain condensation lose