After meeting with their instructor, pablo and johanna know that they need to change their experimental design. they contact a local puppy farm and arrange to do their study with 3-month-old litters of pups from four irish setters, for a total of 24 puppies consisting of 12 females and 12 males. pablo and johanna should probably run the experiment

For several months, weighing and measuring the pups every week

Explanation:

This is to control variables and keep a measurable set of data that can prove or disprove the theory they had developed, and also to isolate cases that can't be attributed to the experiment they had carried out, like puppies loosing weight due to illnesses, or behavioral factors.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.