The fascinating secrets of plant reproduction that scientists are still uncovering
You might think flowers don't have much choice about who they mate with, given they are rooted to the ground and can't move.
You might think flowers don't have much choice about who they mate with, given they are rooted to the ground and can't move.
Plants & Animals
Sep 10, 2024
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Frankenstein's monster was brought to life by the judicious application of a little electricity; and a surprising number of processes in our bodies are regulated by electrical currents too. Now, researchers from Japan reveal ...
Cell & Microbiology
Aug 29, 2024
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A new study showing how a prehistoric sea cow was preyed upon by not one, but two different carnivores—a crocodilian and a shark—is revealing clues into both the predation tactics of ancient creatures and the wider food ...
Paleontology & Fossils
Aug 29, 2024
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The sea anemone Nematostella vectensis is potentially immortal. Using molecular genetic methods, developmental biologists led by Ulrich Technau from the University of Vienna have now identified possible candidates for multipotent ...
Cell & Microbiology
Aug 19, 2024
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117
The common roundworm has helped Monash University researchers unlock new information about fertility and genes. Professor Roger Pocock of Monash University's Biomedicine Discovery Institute has led a team which has found ...
Cell & Microbiology
Aug 19, 2024
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Researchers at the Texas A&M School of Veterinary Medicine & Biomedical Sciences (VMBS) have discovered that phenylbutazone, a non-steroidal anti-inflammatory drug (NSAID) commonly prescribed in horses, can affect the ability ...
Plants & Animals
Aug 13, 2024
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458
The monarch butterfly (Danaus plexippus L.) is one of the most widely popular butterfly species in North America. We are accustomed to seeing its beautiful orange wings with black-veined outlines flying in gardens and wildflower ...
Plants & Animals
Aug 13, 2024
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Researchers at the University of Toronto have mapped the spatial distribution of around 700 long non-coding RNAs, otherwise known as lncRNAs, in the testes. The team discovered much higher levels of lncRNAs in the testes ...
Molecular & Computational biology
Jul 30, 2024
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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
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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
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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.
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