Two true-breeding parents, one who is a Iceberg and Balsamic lover, and the other who is Romaine, Thousand Island lover, are mated. One of the F1 offspring is back-crossed to a Iceberg, Balsamic lover. If the observed counts of each phenotype from 500 F2 offspring are: Ice/Ba Ro/TI Ice/TI Ro/Ba 240 240 10 10 what is the estimated recombination fraction between the two genes?A. Ice/Ba Ro/TI Ice/TI Ro/Ba125 125 125 125B. Ice/Ba Ro/TI Ice/TI Ro/Ba200 100 100 50C. Ice/Ba Ro/TI Ice/TI Ro/Ba205 205 45 45D. Ice/Ba Ro/TI Ice/TI Ro/Ba225 225 25 25E. Ice/Ba Ro/TI Ice/TI Ro/Ba200 200 50 50

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

45 points how are people today being protected from tsunamis? earthquake data is analyzed to detemrine if a tsunami is likely, and if so, warnings are sent out. areas in tsunami risk zones are no longer heavily populated. radar is used to measure wave heights regularly. meteorologists study the winds to determine if wave heights will be large.

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.