Science Current Events | Science News | Brightsurf.com
 

Genes from the father facilitate the formation of new species

October 05, 2007
The two closely related bird species, the collared flycatcher and the pied flycatcher, can reproduce with each other, but the females are more strongly attracted to a male of their own species. This has been shown by an international research team directed by Anna Qvarnström at Uppsala University in today's Net edition of Science. They demonstrate that the gene for this sexual preference is found on the sex chromosome that is inherited from the father and that only females have a copy of. The discovery sheds new light on how new species are formed.

The formation of new species takes millions of years. It often happens when a population (group of individuals) is divided and separated geographically and then adapts to disparate environments over thousands of generations. For instance, the earth's ice ages have led to many such population splits. But divided populations often come into contact with each other before they have had time to become entirely sexually isolated from each other. When individuals mate with each other from such split populations that have not quite become separate species, their offspring (so-called hybrids) often have limited viability.

Anna Qvarnström's research team from Uppsala University in Sweden, working with scientists from Norway, the Czech Republic, the US, and Holland, have studied natural hybridization between two closely related bird species, the collared flycatcher and the pied flycatcher. The two flycatcher species (or "quasi species") have come into contact with each other after having been separated during the last ice age. The question they addressed was whether the flycatchers will conclude the species formation that is under way and become entirely sexually isolated from each other or, instead, if they will meld into the same species again.

"We found that females in the hybrid zone develop a sexual preference for males belonging to their own species and that this preference is determined by genes located on the sex chromosome," says Anna Qvarnström.

In birds, in contrast with most other animals, it is the females that are the so-called heterogametic sex. Their sex chromosomes are called ZW and correspond to XY in humans. In birds, it is the female that is ZW and the male ZZ, but in humans men are XY and women XX. The results show that the preference for their own species is sited on the sex chromosome that the females inherit from their father. The same chromosome also houses the genes that govern the development of the species-specific plumage.

"When genes regulate species-specific features and the preference for these are located close to each other in the DNA, in this case on the same chromosome, species formation is favored. Therefore, the probability of these two flycatcher species merging into the same species again is small," says Anna Qvarnström.

It is possible that this will prove to be a general pattern that can explain how new species can continue to exist even if they occasionally hybridize with each other.

Uppsala University


Related New Species Current Events and New Species News Articles


Climate change alters cast of winter birds
Over the past two decades, the resident communities of birds that attend eastern North America's backyard bird feeders in winter have quietly been remade, most likely as a result of a warming climate.

Tiny travellers of the animal world: Hitchhikers on marine driftwood
A new study led by a Canadian marine zoologist reviews the world list of specialist driftwood talitrids, which so far comprises a total of 7 representatives, including two newly described species.

No single explanation for biodiversity in Madagascar
No single "one-size-fits-all" model can explain how biodiversity hotspots come to be, finds a study of more than 700 species of reptiles and amphibians on the African island of Madagascar.

A new land snail species named for equal marriage rights
Scientists from the Department of Life Science, National Taiwan Normal University and the Biodiversity Research Center, Academia Sinica described a new endemic land snail species. The new species Aegista diversifamilia was long confused for the widely distributed A. subchinensis. The study was published in the open access journal ZooKeys.

Around the world in 400,000 years: The journey of the red fox
Imagine attempting to trace your genetic history using only information from your mother's side. That's what scientists studying the evolution of the red fox had been doing for decades.

Nature Collides with James Bond: Newly Discovered Ant Species Hides in Plain Sight
Researchers plan and plot every considerable aspect of their work, but sometimes it's something unexpected and seemingly insignificant that leads to the real discovery. That was the case for Scott Powell, assistant professor of biology at the George Washington University.

Gene doubling shapes the world: Instant speciation, biodiversity, and the root of our existence
What do seedless watermelon, salmon, and strawberries all have in common? Unlike most eukaryotic multicellular organisms that have two sets of chromosomes and are diploid, these organisms are all polyploid, meaning they have three or more sets of chromosomes-seedless watermelon and salmon have 3 and 4 sets of chromosomes, respectively, and strawberries have 10!

Scientists discover new poison dart frog species in Donoso, Panama
A bright orange poison dart frog with a unique call was discovered in Donoso, Panama, and described by researchers from the Smithsonian Tropical Research Institute and the Universidad Autónoma de Chiriquí, both in Panama, and the Universidad de los Andes in Colombia.

Brazilian zoologists discovered the first obligate cave-dwelling flatworm in South America
Typical cave-dwelling organisms, unpigmented and eyeless, were discovered in a karst area located in northeastern Brazil.

The discovery of 27 vertebrates fully reveals the unmatched biodiversity in Tanzania
A study by an international team of scientists coordinatedby Italy's MUSE - Science Museum updates knowledge on the faunal richness of the Eastern Arc Mountains of Tanzania and Kenya; presents the discovery of 27 new vertebrate species (of which 23 amphibians and reptiles); identifies the drivers of the area's exception biological importance and advocates for its candidature to the UNESCO's List of World Heritage Sites.
More New Species Current Events and New Species News Articles

Moon (New Species)

Moon (New Species)
by Laurann Dohner (Author)


Book 10 in the New Species series. The books can be read as stand-alone stories, but it is advisable to read them in order to get the most enjoyment from the series. Dr. Joyce Yards has never met anyone as sexy or as irresistible as 466. He refuses to discuss anything except getting her naked beneath him. Their therapy sessions are growing hotter, his raw hunger for her is becoming aggressive, and she is falling for him. Joy knows the dire consequences if she gives in to desire. It will break her heart but she must walk away. Moon has been drugged. He is feral and dangerous to everyone. The NSO doctors turn to the only female Moon ever cared about—the one who left him in the desert two years ago. Moon isn’t the same male Joy once knew but she is willing to put her life on the line...

Darkness: 12 (New Species)

Darkness: 12 (New Species)
by Ellora's Cave Publishing Inc


Book 12 in the New Species series. It is advisable to read the books in order to get the most enjoyment from the series.
Kat’s boss wants dirt on the NSO. She is sent to Homeland undercover but everything goes wrong as soon as she enters the front gates. She is arrested by a big, powerful, sexy New Species but she is not frightened. He turns her on and things heat up fast between them. Now, she just hopes he doesn’t break her heart.
Darkness admires Kat’s courage but he cannot trust anything she says. He hasn’t been with a female for years because he knows he is too damaged. He is not mate material, despite his desire to possess her in every way. Darkness fears losing control—the one thing that defines his life. He doesn’t think he can tear down the protective walls...

Smiley (New Species)

Smiley (New Species)
by Ellora's Cave Publishing Inc


Book 13 in the New Species series. It is advisable to read the books in order to get the most enjoyment from the series.
Vanni is furious when her fiancé tricks her into attending a conference where his father’s church is protesting the New Species Organization. She hates everything those vile bigots stand for. Vanni goes to the bar to cool off and ends up seated next to a handsome New Species. Things heat up fast when they are both drugged.
Smiley doesn't want to believe the sweet human would dose them with the breeding drug. He's willing to trust her and determined to save her life. He'll hold her. Protect her. Offer up his body to distract them both from the pain. She is his female, even if she doesn't realize it yet.
A Romantica® paranormal erotic romance from...

Shadow (New Species Book 9)

Shadow (New Species Book 9)
by Ellora's Cave Publishing Inc.


Book 9 in the New Species series. While each New Species book is a standalone, the greatest enjoyment will come from reading them in series order.Beauty resents being labeled Gift Species. Everyone is way too overprotective, males aren’t even allowed to speak to her and so far, true freedom eludes her. Then a big, sexy Species officer mistakes her for the enemy and takes her...

Obsidian (New Species Book 8)

Obsidian (New Species Book 8)
by Ellora's Cave Publishing Inc.


Book 8 in the New Species series.Dr. Allison Baker is obsessed with saving the comatose New Species male. She has tried everything and there’s only one option left. Alli will break every rule and put her life in danger by tempting 880 to wake, using only her feminine scent and touch. She just has to kidnap him and crawl into bed with him to make it work.880 wakes in a different world with a small female who’s been sleeping beside him, caressing him and wrapping her sweet body around his, teasing his senses. He lies silent and still, listening and evaluating each arousing touch, fighting his body’s reaction. Hatred flares when he discovers she’s human, but Mercile stole everything from him so he decides it’s fair to take her in return.
But things quickly change and he wants...

Valiant (New Species, Book Three)

Valiant (New Species, Book Three)
by Ellora's Cave


Book 3 in the New Species series. Tammy has always tried to be prepared for any calamity life might send her way but she never imagined a sexy, lion man-beast in her future. He’s huge, got the most exotic, golden cat-eyes she’s ever seen, and she’s so terrified she’s speechless for the first time in her life. He’s stalking closer, growling at her, and she’s too terrified to even flee. Valiant hates humans. But when he gets a whiff of the adorable human female who has invaded his territory, he starts rethinking. Her fear scents of pure, sweet temptation and the closer he gets, the more appealing she becomes. Once he’s got his hands on her, he isn’t about to let her go. One thought will change his life. MINE! Before Tammy can regain her senses, she’s flat on her back in...

Justice (New Species Book 4)

Justice (New Species Book 4)
by Ellora's Cave Publishing Inc.


Book 4 in the New Species series.Justice North is the face of New Species. Seeing him up close makes Jessie’s heart race. He’s the ultimate alpha male—big, muscular, exotically beautiful…and dangerous. Of course he’s off limits. But then the sexy man purrs and all bets are off.Jessie Dupree is a mouthy, fiery human female who brings out the animal in Justice. She wants to show him how to relax, and he’s all for anything she wants to do, but Justice has sworn to protect his people and to take a Species mate. He’s torn between the woman he wants and the oath he’s taken.Jessie knows a relationship between them probably won’t end well; heartbreak is inevitable. But that won’t stop her from freeing the wildness inside Justice and spending every moment she can steal wrapped...

Tiger (New Species)

Tiger (New Species)
by Laurann Dohner (Author)


Book 7 in the New Species series. While each New Species book is a standalone, the greatest enjoyment will come from reading them in series order. Zandy’s had too much to drink and is in the wrong place at the wrong time. She knows she’s going to die. When next her eyes open, a beautiful man-creature is holding her in his arms. He’s just too tempting to resist, her very own fallen angel. She wraps herself around his body, determined to have him. But when this angel turns out to be flesh and blood, reality crashes in—she’s seducing a New Species. Tiger’s shock quickly turns to intense passion when the human female kisses him, despite the fact she’s trying to get his clothes off while he’s engaged in a task force operation. He’s also made it clear he’ll never take a...

HASH: Human Alien Species Hybrid (Book #1) (The Imprint Trilogy)

HASH: Human Alien Species Hybrid (Book #1) (The Imprint Trilogy)


Every night, Jade is rattled by a recurring dream—a dream that’s as real as the research institute where she lives. When flames fall from the sky and an alien ship crashes into Earth, Jade becomes government property and at the mercy of scientists. After all, she’s imprinted with an intelligent alien metal that could be the answer to all of Earth’s problems.

However, in the wrong hands, the metal implant could become the deadliest weapon known to humankind.

Kept underground for sixteen years, Jade fights to keep her sanity and understand the intelligent organism that is wrapped around her spine. When a new company takes over the science institute, Jade’s alien symbiont warns her of imminent danger.

Then Jade meets Aric, the lone survivor from the...

Ethan's Mate (The Vampire Coalition Book 1)

Ethan's Mate (The Vampire Coalition Book 1)
by J. S. Scott Publishing


Ethan Hale is a vampire with a mission. Together with his three brothers and a few other unmated members, he fights with The Vampire Coalition to protect humans from fallen vampires. His life is fairly simple. If he has a problem...he solves it. If it's an evil problem...he kills it. But his uncomplicated life is about to end when his mate unexpectedly calls him to her.

Brianna Cole is weak, her life force fading away. She thinks she is suffering from a rare form of leukemia. Little does she knows that her illness is much more complicated. She's dying because she has not united with her vampire mate and given him his soul that she has been guarding since birth.

Ethan finds Brianna and knows he needs to convince her to mate or watch her die. He's waited...

© 2014 BrightSurf.com