South African Honeybee Reproduces by Cloning Itself

Bees fly near a hive in Wehrheim near Frankfurt, Germany. Photo: AP
Bees fly near a hive in Wehrheim near Frankfurt, Germany. Photo: AP
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South African Honeybee Reproduces by Cloning Itself

Bees fly near a hive in Wehrheim near Frankfurt, Germany. Photo: AP
Bees fly near a hive in Wehrheim near Frankfurt, Germany. Photo: AP

A team of researchers from the University of Sydney, the ARC-Plant Protection Research Institute and York University, has found that workers in a species of honeybee found in South Africa, also known as "Cape honeybee," reproduce by making near-perfect clones of themselves.

The findings were announced in a paper published in the journal Proceedings of the Royal Society B.

Prior research has found that some creatures reproduce through parthenogenesis, in which individuals reproduce without mating. This form of reproduction has the advantage of not wasting time and energy on mating.

The downside, of course, is loss of genetic diversity, which helps species survive in changing conditions.

For most species, parthenogenesis is a less-than-perfect way to produce offspring. This is because some tiny bit of genetic material is generally mixed wrong—these mistakes, known as recombinations, can lead to birth defects or non-productive eggs. In this new effort, the researchers have found a kind of honeybee that has developed a way to avoid recombinations.

According to a report by Science X Network, the researchers found that South African Cape honeybee queens reproduce sexually, but the workers reproduce asexually. They then conducted a small experiment—they affixed tape to the reproductive organs of a queen, preventing males from mating with her, and then allowed both her and the worker bees in the same hive to reproduce asexually. They then tested the degree of recombination in both.

"They found that offspring of the queen had approximately 100 times as much recombination as the worker bees. Even more impressive, the offspring of the worker bees were found to be nearly identical clones of their parent. More testing showed that one line of worker bees in the hive had been cloning themselves for approximately 30 years—a clear sign that workers in the hive were not suffering from birth defects or an inability to produce viable offspring."

"It also showed that they have evolved a mean for preventing recombination when they reproduce," the report adds.



Soviet-Era Spacecraft Is Expected to Plummet to Earth This Weekend after 53 Years

This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
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Soviet-Era Spacecraft Is Expected to Plummet to Earth This Weekend after 53 Years

This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)

A half-ton Soviet spacecraft that never made it to Venus 53 years ago is expected to fall back to Earth this weekend.

Built to land on the solar system's hottest planet, the titanium-covered spacecraft may survive its fiery, uncontrolled plunge through Earth's atmosphere, predicted to occur on Saturday. But experts said it likely would come down over water, covering most of the world, or a desolate region.

The odds of it slamming into a populated area are “infinitesimally small,” said University of Colorado Boulder scientist Marcin Pilinski.

“While we can anticipate that most of this object will not burn up in the atmosphere during reentry, it may be severely damaged on impact,” Pilinski said in an email.

By Friday, all indications pointed to a reentry early Saturday morning, US Eastern Time, give or take several hours. While space debris trackers around the world converged in their forecasts, it was still too soon to know exactly when and where the spacecraft known as Kosmos 482 would come down. That uncertainty was due to potential solar activity and the spacecraft’s old condition. Its parachutes were expected to be useless by now and its batteries long dead.

Dutch scientist Marco Langbroek estimated the impact speed at 150 mph (242 kph) if the spacecraft remains intact.

The Soviets launched Kosmos 482 in 1972, intending to send it to Venus to join other spacecraft in their Venera program. But a rocket malfunction left this one stuck in orbit around Earth. Gravity kept tugging on it and was expected to finally cause its doom.

Spherical in shape, the spacecraft — 3-foot (1-meter) across and packing more than 1,000 pounds (495 kilograms) — will be the last piece of Kosmos 482 to fall from the sky. All the other parts plummeted within a decade.

Any surviving wreckage will belong to Russia under a United Nations treaty.