Upon careful examination of the offspring obtained from your cross, it was determined that only 25 offspring were double crossover phenotype -- half of the 50 that was expected. now, how many offspring that represent a single crossover event between pr and vg are expected, considering that positive interference has occurred? express your answer as a whole number.

What is one benefit of a nonrenewable resource, such as natural gas? a. generate large amounts of electricity b. less expensive overtime c. produces pollution d. will run out eventually

Which is an example of a decomposer? a. bear b. algae c. grass d. bacteria d bacteria

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.