Fruit flies display geotaxis, or a response to the earth's gravity. if the flies are within a vial and the vial is flipped upside down, the flies will crawl to the top of the vial. a researcher notices that a group of flies that had been exposed to radiation no longer exhibit geotaxis. how could you provide further evidence that this behavior is innate and not learned?

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: