翻訳と辞書 Words near each other ・ Mammal Research Institute of the Polish Academy of Sciences ・ Mammal Review ・ Mammal Species of the World ・ Mammal tooth ・ Mammalia in the 10th edition of Systema Naturae ・ Mammaliaformes ・ Mammalian (film) ・ Mammalian 1 bornavirus ・ Mammalian assemblage zone ・ Mammalian CPEB3 ribozyme ・ Mammalian diving reflex ・ Mammalian eye ・ Mammalian Genome ・ Mammalian meat allergy ・ Mammalian promoter database ・ Mammalian reproduction ・ Mammalian Species ・ Mammaliferous Crag Formation ・ Mammalodon ・ Mammalodontidae ・ Mammalogy ・ Mammals (play) ・ Mammals and Birds Excluder Device ・ Mammals described in the 2000s ・ Mammals of Africa ・ Mammals of Australia ・ Mammals of Borneo ・ Mammals of Glacier National Park (U.S.) ・ Mammals of Grand Teton National Park ・ Mammals of Montana Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Mammalian reproduction ： ウィキペディア英語版 Mammalian reproduction Most mammals are viviparous, giving birth to live young. However, the five species of monotreme, the platypuses and the echidnas, lay eggs. The monotremes have a sex determination system different from that of most other mammals. In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian mammal. The mammary glands of mammals are specialized to produce milk, a liquid used by newborns as their primary source of nutrition. The monotremes branched early from other mammals and do not have the nipples seen in most mammals, but they do have mammary glands. The young lick the milk from a mammary patch on the mother's belly. Viviparous mammals are in the subclass Theria; those living today are in the marsupial and placental infraclasses. A marsupial has a short gestation period, typically shorter than its estrous cycle, and gives birth to an undeveloped newborn that then undergoes further development; in many species, this takes place within a pouch-like sac, the marsupium, located in the front of the mother's abdomen. The placentals give birth to complete and fully developed young, usually after long gestation periods. ==Reproductive system== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mammalian reproduction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.