During a routine prenatal exam,Janet's obstetrician detected the heartbeat of her future baby.The earliest possible period of development medically indicated at this point would be the ________ period.
A) embryonic
B) zygotic
C) fetal
D) epigenetic

Question

Quizplus · Accepted Answer

The embryonic period is the first 8 weeks of prenatal development, which begins at fertilization when the zygote is formed, and ends when the major organ systems have formed. Detection of a fetal heartbeat is typically around 6-8 weeks after fertilization, which would indicate the embryonic period of development. The zygotic period refers to the first two weeks following fertilization, and the fetal period begins during the 9th week of development and lasts until birth. Epigenetic refers to changes in gene expression without changes to the DNA sequence, and is not a stage of prenatal development.

During a Routine Prenatal Exam,Janet's Obstetrician Detected the Heartbeat of Her