In an experiment two inbred strains are mated to each other and the offspring demonstrate heterosis. The offspring (F1s) are crossed to each other and a ratio is obtained where there are 9 individuals that demonstrate heterosis and 7 that are similar to the original parental generation.
What is this most likely a demonstration of?

A) Dominance hypothesis.
B) Overdominance hypothesis.
C) That there is a significant environmental interaction in phenotypic development.
D) Cannot tell from the information given.

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

Aresearcher created three groups based on participants bmi: normal weight, overweight and obese. the hypothesis being tested is that the three groups differ in the mean number of artificially sweetened drinks consumed weekly. which statistical test might the researcher use, assuming a reasonably normal distribution of values.