Cloned tomato cuttings have the same genes. One cutting gets much less sunlight and grows shorter. What does the evidence show caused the growth difference?

Two pea varieties grow in the same greenhouse. One variety is usually tall, and the other is usually short. What best explains the height difference?

Cloned strawberry plants grow in identical pots, but one pot has soil with few minerals. That plant grows fewer leaves. What factor is most likely involved?

A litter of dogs is raised in the same home with the same food, but some adults are much larger. What explanation is best supported?

Oak seedlings from tall parent trees grow in a dry field and a watered field. Seedlings in the dry field stay shorter. Which factors affect how tall these seedlings grow?

A farmer plants seeds from a corn variety bred for tall stalks. In crowded rows, the stalks stay short. What explains this result?

Bacteria from one strain are placed on rich agar and on poor agar, side by side in the same incubator. The rich agar colony spreads faster. What best explains the difference?

Bean plants with the same genes receive equal light, but one group gets much less water. What growth result is most likely?

Tadpoles from the same frog population are raised with equal food. One tank is much colder. What prediction is most likely?

Yeast from one strain grows in warm flasks with either high or low sugar. After a day, how should the low-sugar flask compare?

Cloned basil plants receive equal water and soil. One group is moved from dim light to bright light. What growth change is most likely?

Same-variety lettuce plants are moved closer together while water stays equal. What growth outcome is most likely over time?

Corn seedlings with the same genes are grown with equal water and light. One group receives little nitrogen. What result is most likely?

Mold spores from the same sample are placed on bread at 5 degrees Celsius and 25 degrees Celsius. What should happen at 5 degrees Celsius?

A sunflower variety can grow very tall, but plants of that variety stay short during drought. What reasoning connects the evidence to growth?

Identical plant clones have genes for large leaves. In low light, their leaves remain small. What explanation best fits?

Labrador puppies inherit genes for a large body size, but one puppy receives too little food while growing. What outcome is most likely?

A wheat variety has genes for disease resistance. In a field with the disease, resistant plants grow better than susceptible plants. What interaction explains this?

A corn hybrid grows in sandy soil with little nitrogen. Which of its traits is most likely set by its genes and not changed by the poor soil?

Cattle are bred for large size, but calves raised on poor pasture gain mass slowly. What explanation best matches the evidence?