Sex ratio — is the ratio of males to females in a population. The primary sex ratio is the ratio at the time of conception, secondary sex ratio is the ratio at time of birth, and tertiary sex ratio is the ratio of mature organisms. [Nancy S. Coney and W. C.… … Wikipedia
Digit ratio — Not to be confused with Benford s law about the frequencies of leading digits of numbers. Hand with index finger being shorter than the ring finger, resulting in a small 2D:4D ratio, pointing to a high exposure to testosterone in the uterus. The… … Wikipedia
Breeder reactor — Assembly of the core of Experimental Breeder Reactor I in Idaho, 1951 A breeder reactor is a nuclear reactor that generates more fissile material in fuel than it consumes.[1] These reactors are considered appealing due to their superior fuel… … Wikipedia
Thorium fuel cycle — The thorium fuel cycle is a nuclear fuel cycle that uses thorium 232 as fertile material and uranium 233 as fissile fuel. A major advantage of the thorium fuel cycle is that production of plutonium and other long lived actinides as radioactive… … Wikipedia
Suriname — /soor euh nahm , nam /; Du. /syuu rddee nah meuh/, n. a republic on the NE coast of South America: formerly a territory of the Netherlands; gained independence 1975. 443,446; 60,230 sq. mi. (155,995 sq. km). Cap.: Paramaribo. Also, Surinam /soor… … Universalium
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
Kakapo — Conservation status Critically Endangered ( … Wikipedia
reproductive system, animal — Introduction any of the organ systems by which animals reproduce. The role of reproduction is to provide for the continued existence of a species; it is the process by which living organisms duplicate themselves. Animals compete with… … Universalium
Spawn (biology) — The spawn (eggs) of a clownfish. The black spots are the eyes developing. Spawn refers to the eggs and sperm released or deposited, usually into water, by aquatic animals. As a verb, spawn refers to the process of releasing the eggs and sperm,… … Wikipedia
Sex allocation — is the allocation of resources to male versus female reproduction in sexual species (Charnov 1982). Sex allocation depends upon the breeding system of a species, as well as how reproduction is carried out within each breeding system. Breeding… … Wikipedia
reproductive behaviour — In animals, any activity directed toward perpetuation of a species. Sexual reproduction, the most common mode, occurs when a female s egg is fertilized by a male s sperm. The resulting unique combination of genes produces genetic variety that… … Universalium
