You have isolated two temperature-sensitive mutations in phage l that you suspect may be in the same gene. These phage mutants are called ts-1 and ts-2. Each mutant will form plaques at 35˚C but not at 42˚C. You cross ts-1 to ts-2 phage by coinfecting E. coli at the permissive temperature of 35˚C. When the resulting phage lysate is plated at 35˚C you count 10,000 plaques per ml of phage lysate, but when the same phage lysate is plated at 42˚C, there are only 80 plaques per ml.           What is the distance between the ts-1 and ts-2 mutations in m.u.?

#Question id: 5048

#Unit 5. Developmental Biology

when a cell or tissue is capable of differentiating autonomously even when placed into another region of the embryo or a cluster of differently specified cells in a petri dish. This cell or tissue said to be-

#Question id: 5049

#Unit 5. Developmental Biology

The fundamental notion of a stem cell is that it can make more stem cells while also producing cells committed to undergoing differentiation. This process is called as-

#Question id: 5050

#Unit 5. Developmental Biology

A stem cell capable of producing all the cell types of a lineage(embryonic and extraembryonic) is said to be-

#Question id: 5051

#Unit 5. Developmental Biology

after the 8-cell stage, the mammalian embryo develops an outer layer (which becomes the fetal portion of the placenta), and an inner cell mass that generates all the cells of embryo. The cells of the inner cell mass are thus said to be-

#Question id: 5052

#Unit 5. Developmental Biology

cell populations within each germ layer expand and differentiate, resident stem cells are maintained within these developing tissues and function to generate cell types with restricted specificity for the tissue in which they reside. these stem cells are-

#Question id: 5053

#Unit 5. Developmental Biology

Local cell signaling is carried out via membrane receptors that bind to proteins in the extracellular matrix (ECM) or directly to receptors from a neighboring cell in a process called as-