Start Key Terms: Anatomy & Physiology: Development and Inheritance

Question: autosomal chromosome

Choices:

in humans, the 22 pairs of chromosomes that are not the sex chromosomes (XX or XY)

Question: Braxton Hicks contractions

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weak and irregular peristaltic contractions that can occur in the second and third trimesters; they do not indicate that childbirth is imminent

Question: amniotic cavity

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cavity that opens up between the inner cell mass and the trophoblast; develops into amnion

Question: autosomal dominant

Choices:

pattern of dominant inheritance that corresponds to a gene on one of the 22 autosomal chromosomes

Question: allantois

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finger-like outpocketing of yolk sac forms the primitive excretory duct of the embryo; precursor to the urinary bladder

Question: autosomal recessive

Choices:

pattern of recessive inheritance that corresponds to a gene on one of the 22 autosomal chromosomes

Question: allele

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alternative forms of a gene that occupy a specific locus on a specific gene

Question: afterbirth

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third stage of childbirth in which the placenta and associated fetal membranes are expelled

Question: acrosome

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cap-like vesicle located at the anterior-most region of a sperm that is rich with lysosomal enzymes capable of digesting the protective layers surrounding the oocyte

Question: amnion

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transparent membranous sac that encloses the developing fetus and fills with amniotic fluid

Question: acrosomal reaction

Choices:

release of digestive enzymes by sperm that enables them to burrow through the corona radiata and penetrate the zona pellucida of an oocyte prior to fertilization