Chapter 8.4+8.5 Flashcards

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1
Q

ovum

A

the female sex cell, or egg.

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2
Q

fertilization

A

the union of the ovum and sperm.

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3
Q

zygote

A

cell resulting from the uniting of the ovum and sperm.

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4
Q

monozygotic twins

A

identical twins formed when one zygote splits into two separate masses of cells, each of which develops into a separate embryo.

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5
Q

dizygotic twins

A

often called fraternal twins, occurring when two individual eggs get fertilized by separate sperm, resulting in two zygotes in the uterus at the same time.

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6
Q

bioethics

A

the study of ethical and moral issues brought about by new advances in biology and medicine.

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7
Q

Which three stages of development is their?

A

Germinal period, embryonic period, fetal period

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8
Q

germinal period

A

first 2 weeks after fertilization,

during which the zygote moves down to the uterus and begins to implant in the lining.

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9
Q

embryo

A

name for the developing organism from 2 to 8 weeks after fertilization.

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10
Q

embryonic period

A

the period from 2 to 8 weeks after fertilization, during which the major organs and structures of the organism develop.

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11
Q

critical periods

A

times during which certain environ- mental influences can have an impact on the development of the infant.

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12
Q

teratogen

A

any factor that can cause a birth defect.

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13
Q

fetal alcohol spectrum disorder (FASD)

A

the physical and mental defects caused by consumption of alcohol during pregnancy.

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14
Q

fetal period

A

the time from about 8 weeks after conception until the birth of the baby.

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15
Q

fetus

A

name for the developing organism from 8 weeks after fertilization to the birth of the baby.

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