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Articles 241 - 244 of 244
Full-Text Articles in Animal Studies
Elephants In The Plant World, Dale J. Osborn
Elephants In The Plant World, Dale J. Osborn
Elephant
Survey of plants named for features that recall the elephant.
Meeting Of The Elephant Interest Group At Michigan State University, June 21, 1977, Jeheskel Shoshani
Meeting Of The Elephant Interest Group At Michigan State University, June 21, 1977, Jeheskel Shoshani
Elephant
Digest of the minutes of the first informal meeting of the Elephant Interest Group at the 57th Annual Meeting of the American Society of Mamalogists (ASM).
The Behaviour Of Swine, J. P. Signoret, B. A. Baldwin, D. Fraser, E. S. E. Hafez
The Behaviour Of Swine, J. P. Signoret, B. A. Baldwin, D. Fraser, E. S. E. Hafez
Mammalogy Collection
The pig was a forest-dwelling animal from the beginning of its history. In some parts of the world it has been domesticated for at least 7000 years. The European breeds of domestic swine were derived from the local wild pig, Sus scrofa. Herds ranged in pastures and forests and kept indoors only for fattening. The breeds in the Far East were derived from another wild pig, Sus vittatus, a smaller animal with shorter legs and a higher reproductive ability (Mohr 1960; Zeuner 1963). The two types interbred readily. The modem breeds of pig evolved from different crossings between the two …
Systematic And Evolutionary Implications Of Parthenogenesis In The Hymenoptera, C. N. Slobodchikoff, Howell V. Daly
Systematic And Evolutionary Implications Of Parthenogenesis In The Hymenoptera, C. N. Slobodchikoff, Howell V. Daly
Entomology Collection
Two types of parthenogenesis, arrhenotoky and thelytoky, exist in the Hymenoptera. Arrhenotoky, the development of males from unfertilized eggs, is present in all wasps and bees. Thelytoky, the development of diploid females from unfertilized eggs, is present in a few species. Two types of thelytoky, apomixis and automixis, are known. Most thelytokous Hymenoptera are automictic. No meiosis, only mitosis, occurs in apomixis. Meiosis does occur in automixis, allowing crossing-over and segregation of genes. Advantages of thelytoky are that heterotic combinations become fixed, gene loss is reduced, and reproduction requires only a single individual. One advantage of arrhenotoky is that genetic …