Prenatal Development

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7 Terms

1
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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

2
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When is the Germinal Phase?

from conception until implantation

3
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Characteristics of Germinal Phase (4)

cell division begins, zygote travels down fallopian tube, implantation into endometrium, placenta begins to form

4
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When is the embryonic stage?

from implantation to 8 weeks

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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

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When is the Foetal Stage?

9 weeks until birth

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Characteristics of Foetal stage (3)

all organs and systems are fully formed, sensory development, movement of limbs