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crossing over

(Encyclopedia)crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each ...

Petronas Towers

(Encyclopedia)Petronas Towers, twin skyscrapers in Kuala Lumpur, Malaysia, that are the world's tallest twin towers. Standing 1,483 ft (452 m) high, they were designed by the Argentinian-American architect César P...

Palma

(Encyclopedia)Palma or Palma de Mallorca pälˈmä ᵺā mälyôrˈkä [key], city (1990 pop. 325,120), capital of Majorca island and of Baleares prov., Spain, on the Bay of Palma. It is the chief port and commerci...

Peter III, czar of Russia

(Encyclopedia)Peter III, 1728–62, czar of Russia (1762), son of Charles Frederick, dispossessed duke of Holstein-Gottorp, and of Anna Petrovna, daughter of Peter the Great. He succeeded to the throne on the death...

Bay of Pigs Invasion

(Encyclopedia)Bay of Pigs Invasion, 1961, an unsuccessful invasion of Cuba by Cuban exiles, supported by the U.S. government. On Apr. 17, 1961, an armed force of about 1,500 Cuban exiles landed in the Bahía de Coc...

Special Drawing Rights

(Encyclopedia)Special Drawing Rights (SDRs), type of international monetary reserve currency established (1968) by the International Monetary Fund (IMF). Created in response to worries concerning the limitations of...

Caldera Rodríguez, Rafael Antonio

(Encyclopedia)Caldera Rodríguez, Rafael Antonio räfäĕlˈ käldāˈrä rôᵺrēˈgās [key], 1916–2009, president of Venezuela (1969–74, 1994–99). A lawyer and professor of sociology, he was first elected...

fur trade

(Encyclopedia)fur trade, in American history. Trade in animal skins and pelts had gone on since antiquity, but reached its height in the wilderness of North America from the 17th to the early 19th cent. The demand ...

Frankfurt

(Encyclopedia)Frankfurt äm mīn [key], city (2021 pop. 841,795), Hesse, central Germany, a port on the Mai...

Arikara

(Encyclopedia)Arikara ərĭkˈərə [key], Native North Americans whose language belongs to the Caddoan branch of the Hokan-Siouan linguistic stock (see Native American languages). Archaeological evidence shows tha...