Z chromosome
A sex chromosome in certain animals, such as chickens, turkeys, and moths. In humans, males are XY and females XX, but in animals with a Z chromosome, males are ZZ and females are WZ.
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- Incest
Sexual activity between individuals so closely related that marriage is legally prohibited. Incest involving a child is a form of child abuse.
- Rate, mortality
The number of maternal deaths related to childbearing divided by the number of live births (or by the number of live births + fetal deaths) in that year. The word “mortality” came from the Latin “mors” (death). Mortality is distinct from morbidity (illness). A condition such as tuberculosis can cause morbidity and mortality (disease and […]
- Rate, neonatal mortality
The number of children dying under 28 days of age divided by the number of live births that year. The neonatal mortality rate in the United States, which was 8.4 per 1,000 live births in 1980, declined to 5.8 per 1,000 live births in 1990.
- Rate, pulse
The pulse rate is most often taken at the wrist. It measures the number of pulsations in the radial artery each minute. This most often reflects heart rate.