Three genes in fruit flies affect a particular trait, and one dominant allele of each gene is required to get a wild type phenotype. a. what phenotypic ratios would you expect among progeny of aabbcc x aabbcc flies? (this sub-question is in case you want a lot of practice drawing out punnett squares! hint: there are 3 genes, each of which can be wild type or mutant, so 23= 8 options for each gamete. therefore there are 8 (mom) x 8 (dad) = 64 options). b. you cross a particular wild-type male in succession with three tester strains. in the cross with one tester strain (aabbcc), only 1⁄4 of the progeny are wild type. in crosses involving the other two tester strains (aabbcc and aabbcc) half of the progeny are wild type. what is the genotype of the wild type male?

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

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.