fertilize high clutch sizes in larger females (e.g.,Bourne, 1993; Robertson, 1990), but there is no evidence of this in anyChiromantisspecies. Foam nesting may favor reduced sperm investment under conditions of monogamy, but foam nesting under conditions of polyandry, andsperm competition, may...
egg and sperm In the article‚ " The Egg and the Sperm" by Emily Martin‚ the author attempts to shed light on the gender stereotypes hidden within the scientific language of our biology textbooks. I found this article to be very intriguing because‚ as a nursing student‚ I’ve ...
Yes, there are egg laying mammals and they are known as monotremes. They are named so because of the presence of single cloacal opening in their bodies that serves as a passage for eggs or sperms, feces and urine. The tracts for urine, feces and sperms come straight to this cloaca a...
In the first experiment, the authors recorded that both sexes spawned within a few hours of one another, between mid-afternoon and early evening. The females spawned from one to three egg-masses each spawning, and males released varying amounts of sperm. In the second experiment, the authors...
[toggle title=”Sperm Donor:” state=”open”]It means when a mean donates his semen to the another man and that is used by the another man to produce the child. The one who need the sperm means when a mean dealing with the problem of male infertility and the reason behind it is th...
Parental Care of Eggs 13 13 Please note that many pairs will not incubate their eggs unless at least three eggs are present in their nest. 13 Species foster parents Performing Nest Checks Candling Eggs on or after the fifth day of incubation ...
Queens play an essential role in the colonies of stingless bees. Typically, only one queen occurs in a colony at any time, and she dominates the egg laying
Do eggs and sperm arise by mitosis or meiosis? Mitosis happens when you want to grow, for example. You want all your new cells to have the same DNA as the previous cells. The goal ofmeiosis, however, is to produce sperm or eggs, also known as gametes. ...
In this respect the egg and sperm are complementary structures; their union in syngamy thus restores to each the missing element necessary to further ... DL Kropf - 《Developmental Biology》 被引量: 160发表: 1994年 Structure and Function of the Egg Cortex from Oogenesis through Fertilization cyt...
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