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Embryonic Period
Fetal Period
Development of Embryo and Fetus
Maternal Age and Chromosomes
Inheritence of Disease
100
When does the Embryonic Period begin?
3rd week
100
What week does the fetal period begin?
9th week
100
What is the term for formation and development of red blood cells?
Hematopoiesis
100
What is a loss of a portion of DNA from a chromosome called?
A deletion
100
A spontaneous permanant change in the normal gene structure is called what?
Mutation
200
What week have the main organ systems begun to develop?
8 weeks
200
What is the thick cheese like material that protects the fetal skin from exposure to the amniotic fluid?
Vernix Caseosa
200
What is a specialized connective tissue that surrounds the 2 arteries and one vein in the umbilical cord?
Wharton's Jelly
200
This occurs when there are three particular chromosomes instead of the normal two
A Trisomy
200
This is the most common genetic disease among African Americans
Sickle Cell Anemia
300
When does the yolk sac develop?
2 weeks
300
What is the substance that decreases surface tension in the alveoli?
Surfactant
300
What is the fine downy hair that covers the fetus?
Lanugo
300
This occurs when all or a segment of one chromosome breaks off and attaches to the same or to a different chromosome
A translocation
300
This is useful for assessing the incidences of inherited disorders
A Family Pedigree
400
What are the three germ layers?
Ectoderm, Mesoderm, and Endoderm
400
At what week is the pupillary light reflex present?
30th week
400
The heart begins to beat and blood begins to circulate at the end of what week?
3rd week
400
What defect increases when maternal age is above 35?
Down Syndrome
400
A carrier of an autsomal recessive disorder has what percent risk of passing the disorder onto the offspring?
25%
500
At what week are all four limb buds present?
4 weeks
500
At what week does the fetus develop a strong hand grasp reflex?
At 35 weeks
500
What is the vascular channel that connects the umbilical vein to the inferior vena cava?
Ductus Venosus
500
When a gene necessary for cell function is absent this may result
A disease
500
This is an example of an X-linked dominant disorder
Hypophosphatemia