Growth and Development

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second trimester

continued development makes movement in the womb possible and facial features become apparent

sperm

male gamete

conception

occurs when the male gamete fertilizes the female gamete

third

the respiratory system becomes mature

embryo

after the zygote divides into two cells

how many are contained in the nucleus of each cell in the human body?

46

first trimester

a sac called a placenta forms around the embryo and is connected to the embryo with an umbilical cord and the placenta begins absorbing nutrients and oxygen from the mother's body

egg

female gamete

the male and female gamete each contribute a _____ of the zygote's DNA material

half


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