Marty, SPTA is reviewing a study to determine if there was…

 Marty, SPTA is reviewing a study to determine if there was a positive correlation between the use of Ultrasound and improved healing and R.O.M. at the shoulder. In this study, the research participants were selected at random to receive one of several clinical interventions. The type of study she is reviewing is most likely a ____?

In a particular plant, leaf color is controlled by gene locu…

In a particular plant, leaf color is controlled by gene locus D. Plants with at least one allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding, dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of the F1 cross is diagrammed in the Punnett square shown in the figure, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with dark leaves?