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| [q arm] | eachchromosome is divided into two parts, joined by the centromere. the 'q' arm is the longer of the two segments and is at the bottom of the chromosome. the shorter segment is called the ¡®p¡¯ arm.
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| [Prenatal diagnosis] | the procedureof examining fetal cells taken from the amniotic fluid (amniocentesis), placenta (cvs), or umbilical cord (fbs) to detect fetal abnormalities during pregnancy.
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| [Pregnancy termination] | intervention to ensure that a pregnancy does not continue.
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| [Precursor cell] | an original cell
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| [Prader-Willi syndrome] | a condition characterized by obesity and insatiable appetite, mental deficiency, small genitalia, and short stature. may be caused by a deletion on chromosome 15 or maternal upd15.
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| [Post-zygotic] | after fertilization
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| [Polyploidy] | entire extra sets of chromosomes
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| [Placenta] | the structure that provides the fetus with nourishment during development. it is attached to the wall of the uterus and connects mother and baby.
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| [Phenotype] | theobservable characteristics of a person which are determined by their genes in combination with other modifying genes or the environment.
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| [Paternal UPD] | when both members of a chromosome pair are inherited from the father, instead of one from each parent. |
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