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What happens at fertilisation?
a sperm and ova fuse together to form a zygote containing 23 chromosomes from mother and 23 chromosomes from father
When is the Germinal Phase?
from conception until implantation
Characteristics of Germinal Phase (4)
cell division begins, zygote travels down fallopian tube, implantation into endometrium, placenta begins to form
When is the embryonic stage?
from implantation to 8 weeks
Characteristics of Embryonic Stage (4)
cells form specialised roles, brain and spinal cord are nearly complete, embryo is highly sensitive to teratogens, organs are formed
When is the Foetal Stage?
9 weeks until birth
Characteristics of Foetal stage (3)
all organs and systems are fully formed, sensory development, movement of limbs