Atrue-breeding strain of virginia tobacco has dominant alleles determining leaf morphology (m), leaf color (c), and leaf size (s). a carolina strain is homozygous for the recessive alleles of these three genes. these genes are found on the same chromosome as follows: m c s 6 m. u. 17 m. u. an f1 hybrid between the two strains is now backcrossed to the carolina strain. assuming no interference: a. what proportion of the backcross progeny will resemble the virginia strain for all three traits? b. what proportion of the backcross progeny will resemble the carolina strain for all three traits? c. what proportion of the backcross progeny will have the leaf morphology and leaf size of the virginia strain but the leaf color of the carolina strain? d. what proportion of the backcross progeny will have the leaf morphology and leaf color of the virginia strain but the leaf size of the carolina strain?

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.

Mechanical energy from wind nonrenewable resource