Meeting this challenging task requires an understanding of the meaning of empathy, the use of diverse educational techniques, and incorporation of students' personal experiences. Acknowledging the role of empathy is easy, but teaching empathy is difficult because empathy is an elusive idea.
The sister chromatids are connected to each other at a point called the centromere. During mitosis, the nuclear envelope dissolves, and sister chromatids separate at the centromere, becoming two individual daughter chromosomes, each now with only one chromatid.
At this stage, the embryo is called a blastocyst and has undergone the 1st step in differentiation; it separates into two tissue types, the trophectoderm and the inner cell mass. The trophectoderm is what is destined to become the placenta, while the inner cell mass eventually forms the fetus.