Theory of mutations. Acquired characteristics can NOT be inherited. Hydra and earthworms 42. Fertilizers containing radioactive nitrogen compounds are used for growing experimental plants. The cells of an individual contain 47 chromosomes.
Sheep exhibit incomplete dominance in the trait for eye color.
When a pure brown eyed sheep is crossed with a pure green eyed sheep, blue offspring are produced. In fruit flies, gray body trait is dominant over ebony body trait. On a highway, one often sees crows feeding on dead animals. In a certain ecosystem, snakes and owls prey upon moles and field mice. The appearance of hawks in the system would add another predator.