Some insects have detachable penises, others produce sperm that is 20 times the size of their own body. Others have evolved with special equipment to help them tear rivals off potential mates. Insects can be creepy, promiscuous ...
Plants & Animals
Jun 25, 2024
0
1
A large number of whales is visiting the waters off New England, and the group includes an unusually high number of an endangered species, said scientists who study the animals.
Ecology
Jun 13, 2024
0
0
Using liverwort (Marchantia polymorpha) as a model, researchers led by Prof. Li Hongju from the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences have explored the molecular mechanism of sperm ...
Plants & Animals
Jun 3, 2024
0
1
Researchers from Dresden University of Technology (TUD) and the University of Sheffield have discovered that male fertility can adapt to microbes. These findings shed new light on the importance of sperm ecology and might ...
Evolution
May 24, 2024
0
48
A group of scientists from Nagoya University in Japan has used a specialized microscopic technique to observe the internal reproduction process of the Arabidopsis plant. Their findings, published in EMBO Reports, reveal the ...
Plants & Animals
May 21, 2024
0
113
The past decade has seen an explosion of new research into some of the most fascinating sounds in the sea: the vocalizations of whales and dolphins.
Plants & Animals
May 19, 2024
0
32
A pod of killer whales attacked and sank a yacht over the weekend between Spain and Morocco in the Strait of Gibraltar—and it's not the first time.
Plants & Animals
May 16, 2024
0
27
Researchers from Project CETI (Cetacean Translation Initiative) and collaborating institutions have developed a method to investigate sperm whale communication by determining their vocal style, finding that groups living ...
Ecology
May 15, 2024
0
35
A young whale's journey across the Mediterranean highlights the many threats facing ocean animals, researchers say.
Plants & Animals
May 14, 2024
0
20
Despite their formidable bodies, male gorillas are lacking in one particular area of their anatomy.
Evolution
May 14, 2024
0
359
The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.
The spermatozoa of animals are produced through spermatogenesis inside the male gonads (testicles) via meiotic division. They are carried out of the male body in a fluid known as semen. Mammalian sperm cells can live for up to 3 days inside the female reproductive system.[citation needed]
Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.
This text uses material from Wikipedia, licensed under CC BY-SA
