In Amaryllis large flower inflorescence (F) is dominant over small (f) and strapped leaves (S) is dominant over non-strapped (s). An F1 derived from pure lines is test crossed and below are the progeny phenotypes: 81 were strapped and have large flowers 79 were non-strapped and have large flowers 68 were strapped and have small flowers 72 were non-strapped and have small flowers Use X2 analysis to determine if these genes exhibit Mendelian inheritance.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?