Part 3: Post-Lab Questions 1. How similar are the observed phenotypes in each replicate? 2. How similar are they if you pool your data from each of the five replicates? 3. Is it closer or further from your prediction? 4. Did the results from the monohybrid or dihybrid cross most closely match your predicted ratio of phenotypes? 5. Based on these results, what would you expect if you were looking at a cross of 5, 10, or 20 independently sorted genes? 6. Why is it so expensive to produce a hybrid plant seed? 7. In certain bacteria, an oval shape (O) is dominant over round (o) and thick cell walls (T) are dominant over thin (t). Show a cross between a heterozygous oval, thick cell walled bacteria with a round, thin cell walled bacteria. What are the phenotypes of the F1 and F2 offspring?

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

plant because they survive by water, sunlight, ex.

explanation:

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.