Sperm News and Research

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The term sperm 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.

X and Y Chromosome Genes Compete for Sperm Success in Mice

In evolutionary terms, fitness is defined as an organism's ability to survive and reproduce its genes into the next generation.

7 Apr 2025

Unraveling the Flowerpot Snake's Unique Genome

The flowerpot snake, recognized as one of the smallest snakes globally, possesses some remarkable characteristics.

3 Apr 2025

Intermittent Fasting Alters Serotonin Levels to Boost Male Mice's Libido

Long-term fasting in 24-hour cycles increases the sex drive of male mice by lowering the concentration of the neurotransmitter serotonin in the brain.

29 Mar 2025

Programmable Embryoids Provide Insight into Early Development

The earliest days after fertilization, once a sperm cell meets an egg, are shrouded in scientific mystery.

22 Mar 2025

Unlocking the Secrets of Fertilization Inhibition

A research team headed by Yale scientists has elucidated the workings of a natural biological process that blocks the interaction between sperm and egg, thus inhibiting fertilization.

4 Mar 2025

Researchers Develop Feline Embryonic Stem Cells to Advance Veterinary Medicine

As different as they may seem, humans and cats have similar ailments, but in terms of health care, veterinary regenerative medicine is not as advanced.

28 Feb 2025

Scientists Create First Healthy Mice with Two Fathers

A group of stem cell researchers has successfully engineered embryonic stem cells to create a bi-paternal mouse, a mouse with two male parents, that survived to adulthood.

29 Jan 2025

Study Reveals How Male Ruff Birds Use a "Super Enzyme" to Tame Excess Testosterone

We normally associate high testosterone levels with male dominance and aggression. Among ruffs – a shore bird that breeds across Europe and Asia – some males suffer from too much of it.

24 Jan 2025

New Research Sheds Light on Y Chromosome’s Role in Male Infertility

Researchers at the Crick have uncovered which genes on the Y chromosome regulate the development of sperm and impact fertility in male mice.

24 Jan 2025

Echidna Genome Sheds Light on Complex Sex Chromosome Evolution

A nearly gapless genome sequence of the echidna, an egg-laying mammal with multiple sex chromosomes, helps researchers to track genomic reorganization events that gave rise to a highly unusual sex determination system.

9 Jan 2025

Researchers Discover Key Factor Behind Disease Resistance in Gene Carriers

New work by Columbia researchers has turned a textbook principle of genetics on its head and revealed why some people who carry disease-causing genes experience no symptoms.

3 Jan 2025

Hormonal Control of Caste Determination in Ants

Most ants have two morphologically differentiated adult castes - queens and workers - each irreversibly specialized for either reproduction or nonreproductive altruism such as foraging, defense and care of maternal brood. Adult gynes (virgin queens) normally have higher body mass, wings and frontal eyes, as well as enlarged ovaries and a sperm storage organ.

24 Nov 2024

Groundbreaking Study Reveals New Insights into Fruit Fly Reproduction

You have likely not spent much time thinking about the uterus of the fruit fly, Drosophila melanogaster.

28 Oct 2024

Insights into the Formation of Nascent Membrane Structures in Yeast Sporulation

Sexual reproduction, a common mode of reproduction among numerous species, involves gametogenesis in which offspring are produced through fertilization, conjugation, or mating. In plants and animals, eggs and sperm differentiate from germ cells to form gametes.

30 Sep 2024

Study Reveals Genes Influencing Menopause and Cancer Risk

New research has found four genes with some of the largest known effects on the timing of menopause discovered to date, providing new insight into links between menopause timing and cancer risk.

12 Sep 2024

Automated DNA Separation for Sexual Assault Cases: A Breakthrough in On-Site Forensic Analysis

This study presents a digital microfluidics approach for rapid DNA extraction from sexual assault samples, significantly improving forensic analysis efficiency.

11 Sep 2024

Discovery of Ancient Stem Cells in Sea Anemones Offers Clues to Immortality and Regeneration

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 stem cells in the sea anemone for the first time.

20 Aug 2024