Cell specialization

1. All cells in a multicellular organism arise from a single cell called a [blank_start]zygote[blank_end]. 2. A human zygote divides and differentiates into more than 200 different types of [blank_start]specialized[blank_end] cells. 3. In humans, the first few divisions of a zygote produce [blank_start]embryonic stem cells[blank_end]. 4. Most stem cells become committed to developing into only one kind of specialized cell through a process called [blank_start]determination[blank_end]. 5. A committed stem cell acquires all the characteristics and functions of a specialized cell through a process called [blank_start]differentiation[blank_end]. 6. Cells that are no longer needed die off in a process of programmed cell death called [blank_start]apoptosis[blank_end].