In zebrafish, three genes have been mapped on the third chromosome, in the order fiz---6 m. u.---myob14 m. u.sufi The wild-type allele of each gene is dominant. A strain that is fiz myob sufi / + + + is testcrossed, and there are 1000 offspring fish.

(1) How many wild-type offspring would you expect to see in these 1000 offspring?
(2) How many fiz + + offspring would you expect to see in these 1000 offspring?

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

How does human environment effect the biosphere