That's why Sloan Kettering Institute (SKI) researchers used a strain of mutant mice as a means to uncover new clues about the process of meiosis, which forms eggs and sperm (also known asgerm cells). The investigators learned how breaks in DNA can lead to unanticipated types of harmful mut...
Snook's research has shown that natural selection filters out all but the most successful shapes and sizes of sperm. It might seem strange that both long and short sperm can be favoured, but it is all a matter of competition and choice. When females mate with multiple males, sperm cells m...
2.(Zoology) Also called:soft roethe testis of a male fish filled with mature sperm 3.(Zoology) the ripe ovary of certain crustaceans, such as the lobster [C15: from Middle Dutchroge, from Old High Germanroga; related to Old Norsehrogn] ...
The meaning of EGG is the hard-shelled reproductive body produced by a bird and especially by the common domestic chicken; also : its contents used as food. How to use egg in a sentence.
Startingwithaperson'sownskinwouldalsomeanthelab-grownspermoreggswouldnotberejectedbythebody. 利用某人自身的皮肤进行制备也就意味着,这种实验室培养的精子或卵子不会遭人体排斥。 7 IVFisamethodofassistedreproductioninwhichaman'sspermandawoman'seggsarecombinedoutsideof thebodyinalaboratorydish. ...
Some cells are set up to become stem cells, which will then have the potential to develop into any type of cell in the body. And some cells in the fetus become primordial germ cells and eventually evolve into the cells of either sperm or eggs, which will allow this offspring to pass th...
A transplantation assay demonstrated that the in vitro-expanded GSCs exhibited stem cell activity and potency to produce functional eggs, sperm, and eventually healthy offspring. In vitro expansion of GSCs can aid in rescuing fishes that are on the verge of extinction....
Discover fascinating facts about shark eggs and the unique protective cases known as mermaid's purses. Learn about oviparous sharks and their reproductive behavior in this informative blog post."
Some regions are differentiated into more specialized structures. Because the eggshell is so impermeable, there must be a special provision to allow sperm to enter. Themicropylar apparatusis synthesized by the border cells and provides a channel to the oocyte cell membrane. It consists of an openi...
B Sex determination via postzygotic chromosome elimination in fungus gnats and gall midges. The mechanism of sex determination is similar in the two families, with the subtle distinction that zygotes in fungus gnats are triploid because sperm provide two X chromosomes. One extra chromosome is ...