Three independently segregating genes (A, B, C), each with two alleles, determine height in a plant. Each capital-letter allele adds 2 cm to a base height of 2 cm. a. What are the heights expected in the progeny of a cross between homozygous strains AA BB CC aa bb cc? b. What is the distribution of heights (frequency and phenotype) expected in an cross? c. What proportion of plants will have heights equal to the heights of the original two parental strains? d. What proportion of the will breed true for height?

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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

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