In a group of students, 69% can roll their tongues, a trait determined by a dominant gene. The other 31% of the students were non-tongue rollers. Calculate the frequency of the R and r alleles for tongue rolling in this group of students.

Which law represents a balanced chemical equation?

“in 1492 columbus sailed the ocean blue” is an example of: a)explicit memory b) procedural memory c) semantic memory d)episodic memory

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.