Term
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Definition
| the fusion of a secondary oocyte and a spermatozoon, which forms a zygote |
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Term
| The fertilization process: |
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Definition
Step 1 - fertilization and oocyte activation
Step 2 - Pronucleus formation begins
Step 3 - Cytokinesis begins
Step 4 - Cleavage begins
Step 5 - Spindle formation and cleavage preparation |
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Term
| What are the three stages of prenatal development? |
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Definition
| first, second and third trimesters |
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Term
| What are critical events of the first trimester? |
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Definition
Implantation - attachment of fertilized egg
Placentation (placenta - blood vessels)
Embryogenesis - formation of viable embryo |
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Term
| What fluid surround and cushions the fetus? |
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Definition
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Term
| During the second and third trimesters what supports the developing fetus? |
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Definition
| the maternal organ system |
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Term
| Labor consists of what three stages? |
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Definition
dilation - cervix dilates
expulsion - delivery of baby (usually less than 2 hours)
placental - Uterine contractions expel the placenta |
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Term
| What are the postnatal stages in a person's life? |
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Definition
neonatal period
infancy
childhood
adolescence
maturity
senescence - aging |
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Term
| What determines the patterns of inheritance? |
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Definition
|
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Term
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Definition
| The fertilized egg (ovum), prior to the start of cleavage |
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Term
| Normal somatic cells contain how many chromosomes? |
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Definition
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Term
| What are the two types of sex chromosomes? |
|
Definition
X and Y
Male = XY
Female = XX |
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Term
| What is differentiation in embryonic development? |
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Definition
Selective activation: Some genes are turned on and some are turned off |
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