by U.S. Dept. of Agriculture, National Agricultural Library in Beltsville, Md .
Written in English
|Statement||searched by Jerry Rafats.|
|Series||Quick bibliography series -- NAL BIBL. QB 86-49., Quick bibliography series -- 86-49.|
|Contributions||National Agricultural Library (U.S.)|
|The Physical Object|
|Pagination||22 p. ;|
|Number of Pages||22|
Parthenogenesis is the development of a new offspring from an unfertilized egg. Parthenogenetic lineages occur in many insect species, but are widespread among other invertebrate taxa (Table 1). It entails modification or absence of meiosis so that the eggs remain diploid and do not have to fuse with sperm to give rise to a diploid zygote. Parthenogenesis is an adaptive strategy that allows organisms to reproduce when sexual reproduction is not possible due to environmental conditions. Parthenogenesis that happens by apomixis involves the replication of an egg by mitosis resulting . Parthenogenesis is the formation of a 1 n embryo directly from an unfertilized egg. Apospory and apogamy occur in bryophytes, pteridophytes, and angiosperms, whereas parthenogenesis occurs in ferns and angiosperms. Apogamy is more common in pteridophytes, but . Parthenogenesis is a type of asexual reproduction in which the development of mostly a female gamete takes place without fertilization. This type of reproduction is mostly shown by lower plants, some reptiles, and fishes, who do not possess sex chromosomes. Parthenogenesis is a Greek word that literally translates to “Virgin Origin”.
Parthenogenesis is the development of an egg into a complete organism without the need for fertilization by a male. This process is responsible for "virgin births" in the animal world and has been recorded in several insect, amphibian, and reptilian species. Parthenogenesis is the development of an unfertilized egg into a new individual. Coined by Carl Theodor Ernst von Siebold (b. –d. ) in , the literal meaning of parthenogenesis is “virgin reproduction”—reproduction in the absence of males. Perhaps, a portion of the very early embryonic mortality described in previous studies in first of sequence eggs may be parthenogenic development of unfertilized eggs. Cassar et al. (b) revealed that not all very early embryonic mortality is the result of parthenogenesis in unfertilized eggs of mated hens. Approximately 27% of the laying hens produced at least 1 egg with parthenogenic development. However, about 10% (30) of these hens exhibited a predisposition for parthenogenesis by producing 2 or more unfertilized eggs with embryonic development. Twenty percent of the eggs from 2 hens produced embryonic development.
The term parthenogenesis was coined by Richard Owen. It is also called Virgin Birth or Apomixis. It is the special form of reproduction where an unfertilized egg is directly developed into a fully formed haploid animal. The young ones produced by this process of parthenogenesis are called parthenotes and it maintains the uniparental inheritance. INTRODUCTION Parthenogenesis is a form of asexual reproduction in which growth and development of embryos occur without fertilization. In animals, parthenogenesis means development of an embryo from an unfertilized egg cell and is a component process of apomixis. The word parthenogenesis comes from the Greek, parthenos, meaning "virgin" and genesis, meaning . particular genotype will find a new host for adult development. Parthenogenesis - Asexual reproduction can occur by parthenogenesis (virgin birth) in which unfertilized eggs develop into adults. Because offspring arise from gametes, parthenogenesis is thought to be a more advanced and recent form of asexual reproduction. Artificial Parthenogenesis and Fertilization is a revised and English-translated work from his earlier book, Die chemische Entwicklungserregung des tierischen Eies (). Artificial Parthenogenesis describes Loeb’s many and varied methodical experiments to initiate egg development without fertilization by sperm. As is true with much of.