reproduction Flashcards
viviparity requires greater parental investment to produce few high quality young, this is why many mammals are…
iteroparous (multiple breeding attempts over a longer lifespan)
viviparity and lactation may have catalysed the evolution of…
diphyodont dentition (multiple sets), mother offspring bonds, extended parental care, and social learning
which groups of mammals have cloaca’s
marsupials, monotremes
which groups have abdominal testes?
monotremes,cetacea,xenarthra,paenungulata
what is the nameof the penis bone?
baculum / os penis
marsupials and echidna have …………. penises?
bifid
baculum’s can be diagnostic of……….?
age, lineage
what type of uterus do monotremes have?
cloaca leading to uterus on one side and ovary on the other
one opening leading to three vaginal canals connected to 2 uteri. this is a description of the uterine anatomy of what group?
marsupials/ metatherians
higher primates have ……….. uterine anatomy, it involves 2 ovaries joining …………………………..?
simplex, one uterus, cervix and vagina.
most chiropterans have ……….uterine anatomy, it involves 2 ovaries joining…………………?
bicornulate ,one partially separated uterus,one cervix and one vagina.
cetaceans have ……………uterine anatomy. it involves 2 ovaries joining………………..?
bipartite, a pair of uteri that share a cervix and vagina.
rodents have………………uterine anatomy.it involves 2 ovaries joinging……………………….?
duplex, 2 separate uteri each with its own cervix linking into the same vagina.
5 types of oestrus cycle?
monoestrus, polyoestrus, menstrual, spontaneous, induced (induced imlantation, lagomorphs and carnivores)
2 methods of reproductive delay and what they involve?
delayed development-blastocyst forms and implants, embryonic development stalls. delayed implantation - blastocyst not implanted (embryonic diapause).
