Exam how do we know if a trait is caused by one gene or by two genes that interact? example: dihybrid cross of pure-breeding parents produces three phenotypes in f2 progeny if single gene with incomplete dominance, then f2 progeny should be in 1: 2: 1 ratio if two independently assorting genes and recessive epistasis, then f2 progeny should be in 9: 3: 4 ratio these ratios can appear very similar. further breeding studies can reveal which hypothesis is correct.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

the eggs of the insects should be the first thing collected at the scene.

false

to this one it would be receptive field