Flashcard Set Preview
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| 1 |
when is germinal period
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conception - 2 weeks(zygote implanted in uterine wall)
there is rapid cell division
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| 2 |
when is embryonic period
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3rd - 8th week
major development of organs & systems
cell division, migration, differentiation...
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| 3 |
when is fetal period
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9th week - birth
development of physical structures & rapid body growth. behavior, sensory...
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| 4 |
conception aka fertilization
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sperm & egg cell (gametes) unite in one of the 2 fallopian tubes fertilized egg becomes zygote...
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meiosis
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specialized cell division which results in each gamete's having only 1/2 the genetic material...
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| 6 |
male:female ratio at conception
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Y chromosome sperm swim faster bc theyre lighter, so there are 120 or 150 males for every 100...
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at what age is the male:female ratio about equal
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during late adolescence & early adulthood (18-20 something)...coincidentally when we're mating!
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| 8 |
how do identical twins originate?
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inner cell mass splits in half, resulting in development of genetically identical individuals
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| 9 |
how do fraternal twins originate?
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2 eggs are released into fallopian tube at same time & fertilized by different sperm
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| 10 |
when does cell division begin?
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24 to 36 hours after conception. It continues at rapid rate & cells develop. By 4th day it...
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| 11 |
blastocyst
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hollow sphere of cells with a bulge of cells on one side known as inner cell mass, which eventually...
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| 12 |
implantation
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when blastocyst arrives at uterus & attaches to uterine wall
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| 13 |
3 layers of blastocyst
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ectoderm:become the skin and nervous system
mesoderm:become the muscle and skeletal systems
endoderm:become...
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| 14 |
cephalocaudal development
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areas near head develop earlier. head before body & hands before feet.
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| 15 |
proximal-distal development
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Development starts in the center areas, such as the internal organs, and proceeds to more distal...
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