Oskar Wilhelm August Hertwig
Oskar Wilhelm August Hertwig
1849-1922
German zoologist and embryologist who in 1876 postulated that fertilization is a result of the fusion of germ cell nuclei from the male and female parents. This was a departure from the traditional view that the sperm induced a physical vibration or chemical change in the egg that caused it to develop. He observed that only one spermatozoon is required to fertilize the egg, and that after this occurs, additional sperm cells are prevented from entering.
More From encyclopedia.com
Ovum , ovum (ō´vəm), in biology, specialized plant or animal sex cell, also called the egg, or egg cell. It is the female sex cell, or female gamete; the ma… Embryo Sac , embryo sac The female gametophyte (an oval structure in the nucellus of the ovule) of flowering plants, formed by the division of the haploid megaspo… Embryonic Development , All embryonic structures are derived from a single cell formed by the union of two gametes. Every individual organism began as a single cell, which d… Zygote , Zygote
Definition
The zygote is the single cell that is formed when the sperm cell fertilizes the egg cell. The zygote divides multiple times, produc… Arrhenotoky , arrhenotoky The phenomenon occurring in the reproduction of certain animals in which fertilized eggs give rise to females and unfertilized eggs to ma… Gamete , Gamete
A gamete is a specialized reproductive cell . The cells usually have one half as many chromosomes in their nuclei as the majority of body cell…
You Might Also Like
NEARBY TERMS
Oskar Wilhelm August Hertwig