Fertilization is the union of a single sperm and an egg, an event that results in a diploid
embryo. Animals use many mechanisms to achieve this ratio; the most prevalent involves …

The gametes of man and some other Eutheria have been manipulated successfully for
practical reasons, but many gaps remain in our basic understanding of the way that they …

Drawing on the latest research from around the world, Life of Marsupials explores this
unusual group of mammals covering the extraordinary diversity of forms around the world …

The duration of sperm storage by females differs markedly between reptiles (maximum:
2555 d [7 years] and birds (maximum: 117d), with mammals showing both very short (< 1 d) …

The physiological mechanisms which regulate and maintain oviducal sperm selection,
transport, and storage are reviewed in this article. In addition, oviduct structure, sperm …

One of the proposed mechanisms of polyspermy block is an increased resistance of the
zona pellucida (ZP) to proteolytic digestion (ZP hardening) as a consequence of cortical …

The timing of development was examined in 496 embryos from female Monodelphis
domestica, collected at known time intervals after video recorded mating. Ovulation occurred …

Long‐term sperm storage by females in various regions of the oviduct is documented across
many invertebrate and vertebrate species. Although, many reports emphasize on the …

The mating system of the Virginia opossum, a solitary, nocturnal marsupial, was studied over
a period of two years in north–central Florida. There were two mating seasons each year …

This study provides new findings on the placenta of Monodelphis domestica and a
reconstruction of the marsupial morphotype. To achieve this, early ontogeny and …