Multiple Choice
One can tell the age of a skeleton by looking at the:
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11. Cell Division
Introduction to Cell Division
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Which event marks the end of the germinal period during early embryonic development?
A
Formation of the neural tube
B
Implantation of the blastocyst into the uterine wall
C
Initiation of gastrulation
D
Onset of organogenesis
Verified step by step guidance1
Understand the germinal period: The germinal period is the first stage of prenatal development, lasting from fertilization to implantation. It typically spans the first two weeks of development.
Identify the key events during the germinal period: During this stage, the zygote undergoes rapid cell division (cleavage), forms a blastocyst, and travels down the fallopian tube toward the uterus.
Recognize the significance of implantation: Implantation occurs when the blastocyst attaches to the uterine wall, marking the transition from the germinal period to the embryonic period. This event is critical for establishing a connection between the embryo and the maternal blood supply.
Differentiate between the other options: Formation of the neural tube, initiation of gastrulation, and onset of organogenesis occur later in development, during the embryonic period, not the germinal period.
Conclude that the correct event marking the end of the germinal period is the implantation of the blastocyst into the uterine wall.
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