Navigation Links
Biologists link sexual selection and placenta formation
Date:7/9/2014

ity of modes of reproduction in the Poeciliidae family. Further, it uses this diversity to perform a formal statistical test of an evolutionary theory called the "viviparity driven conflict hypothesis."

Reznick explained that a research paper in 2000 originally proposed this hypothesis, arguing that there must be a relationship between how animals reproduce and how important sexual selection is in choosing mates. Specifically, when animals evolve placentas, the paper's authors predicted a shift away from choosing who to mate with towards mating with multiple mates, then choosing which fertilized egg to nourish through to the end of development.

"The question is why this change?" Reznick said. "Females of non-placental species fully provision eggs before they are fertilized. If they are to choose a mate, then the choice must be made on the basis of the mate's appearance or behavior. Females of placental species make most of their investment in offspring after the egg is fertilized. This is also a time when the father's genome is active and contributing to the development of the baby. They thus have the ability to choose fathers on the basis of the performance of the developing baby."

All that glitters (in fish tanks) is non-placental

The Poeciliidae family includes guppies, platys, swordtails, and mollies that are frequently on sale in pet stores.

"The reason they are in pet stores is that all of these species are non-placental," Reznick said. "They have males with gaudy colors or elaborate display structures, like the tail of a swordtail or the enlarged fins of sailfin mollies. Gaudy males, it turns out, are more profitable."

Reznick noted that the work his lab is engaged in could not be done on mammals.

"All placental mammals inherited their placenta from a single common ancestor that lived more than 100 million years ago," he explained. "Whatever was happening then has long since been
'/>"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. IU biologists offer clearer picture of how protein machine systems tweak gene expression
2. Microbiologists can now measure extremely slow life
3. American Society of Plant Biologists honors early career women scientists
4. Penn biologists identify a key enzyme involved in protecting nerves from degeneration
5. University of Toronto biologists predict extinction for organisms with poor quality genes
6. Biologists turn back the clock to understand evolution of sex differences
7. Double the pain: RUB biologists find the cause of pain in the treatment of fair skin cancer
8. UCLA biologists reveal potential fatal flaw in iconic sexual selection study
9. New book on stereology by Mark West is essential reading for neurobiologists
10. SF State biologists tag zombees to track their flight
11. Biologists unlocking the secrets of plant defenses, 1 piece at a time
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Biologists link sexual selection and placenta formation
(Date:6/24/2015)... 24, 2015 The biologics safety testing market ... for the market include growth of the pharmaceutical and ... launches. Over the years, the number of drug approvals ... 2010, the FDA approved 225 drug applications and Health ... Europe accounted for 3,822 of the ...
(Date:6/24/2015)... 24, 2015  Synaptics Inc. (NASDAQ: SYNA ... today announced that Sharp has selected its industry-leading ... for its latest flagship smartphone device, the AQUOS ... million shipments of its fingerprint ID sensor technology, ... scalability and leadership in the biometrics market through ...
(Date:6/24/2015)... 2015 Biometry authentication provider KeyLemon today ... solution one face in. Logo ... face in, entering the expanding biometric authentication market ... biometric answer to the password problem. With advanced ... with KeyLemon, one face in allows users to ...
Breaking Biology News(10 mins):Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 2Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 3Biological Safety Testing Market by Application, Product, & Test - Global Forecast to 2019 4Synaptics Brings Natural ID Technology to Sharp's Newest Flagship Smartphone 2KeyLemon Announces Partnership With Biometric Password Solution onefacein 2
... DURHAM, N.C. -- By mimicking the way embryonic stem cells ... believe they have taken an important first step toward growing ... disease. In a series of experiments using mouse embryonic ... own design to fashion a three-dimensional "patch" made up of ...
... release is available in Spanish . , ... fruits, nuts, whole grains and fish- appear less likely to ... Navarra, published in the October issue of Archives of ... has been found to be lower in Mediterranean than Northern ...
... BIO-key International, Inc. (OTC Bulletin Board: BKYI), a leader ... a member of the Oracle® PartnerNetwork, is showcasing its ... being held at the Moscone Center in San Francisco ... the Oracle Identity Assurance Partner Alliance, BIO-key will provide ...
Cached Biology News:New strategy for mending broken hearts? 2Mediterranean diet associated with reduced risk of depression 2BIO-key(R) International to Exhibit at Oracle(R) OpenWorld 2BIO-key(R) International to Exhibit at Oracle(R) OpenWorld 3
(Date:7/3/2015)... , July 3, 2015 ... "Lab for Open Innovation in Science", som ... . Søknadene sendes på nett, på  http://www.openinnovationinscience.at ... september 2015.  De to største ... til å undersøke nye forskningsspørsmål og kompleksiteten ...
(Date:7/2/2015)... ... ... used in countless labs for decades. In the past, people had to go to ... was a daunting and tiring process looking at endless data tables and charts. Often ... complex catalog structure. , Now thanks to FireflySci, scientists are throwing away those old books ...
(Date:7/2/2015)... Amici Procurement Migrates to the ... Procurement has chosen Microsoft Cloud Solution Provider iomart ... 365.      (Logo: http://photos.prnewswire.com/prnh/20121126/579634) , ... in the bio-tech sector with a unique procurement service, ... to help them obtain best value. Its IT platform ...
(Date:7/1/2015)... ... July 01, 2015 , ... It is now possible ... using single photon emission computed tomography (SPECT) according to researchers from Amen ... examined over 20,000 brain scans and is believed to be the largest brain imaging ...
Breaking Biology Technology:Lansering av verdens første Open Innovation-program for utdanning av forskere 2Lansering av verdens første Open Innovation-program for utdanning av forskere 3New Cuvette E-Commerce Website Launched by FireflySci 2Biotech Procurement Company Moves to Office 365 with iomart 2Brain Scans Can Tell Post-Traumatic Stress Disorder and Traumatic Brain Injury Apart According to New Research by Amen Clinics 2Brain Scans Can Tell Post-Traumatic Stress Disorder and Traumatic Brain Injury Apart According to New Research by Amen Clinics 3Brain Scans Can Tell Post-Traumatic Stress Disorder and Traumatic Brain Injury Apart According to New Research by Amen Clinics 4
... SAN MATEO, Calif., July 22, 2011 NeurogesX, Inc. ... on developing novel pain management therapies, today announced that ... purchase agreement in connection with a private placement to ... standard closing conditions, is expected to receive approximately $20 ...
... RO, ROG; OTCQX: RHHBY) announced today that the cobas ... for use in colorectal cancer. The cobas ... of colorectal cancer tissue that are predictive of individual ... antibody therapies. "By quickly and reliably ...
... have created a molecular polyhedron, a ground-breaking assembly that ... and consumer products, including magnetic and optical materials. ... the journal Science , was conducted by researchers ... Molecular Design Institute and the University of Milan,s Department ...
Cached Biology Technology:NeurogesX, Inc. Announces $20 Million Private Placement 2NeurogesX, Inc. Announces $20 Million Private Placement 3NeurogesX, Inc. Announces $20 Million Private Placement 4KRAS Diagnostic Test That Assists With Personalized Treatment of Colorectal Cancer Receives CE Mark 2KRAS Diagnostic Test That Assists With Personalized Treatment of Colorectal Cancer Receives CE Mark 3Chemists create molecular polyhedron -- and potential to enhance industrial and consumer products 2
... The ApopTag Red In Situ Apoptosis ... by the indirect TUNEL method, utilizing ... fluorochrome. The kit provides indirect immunofluorescence ... analyzed using either fluorescence microscopy or ...
... method for labeling DNA breaks to detect ... contains all the key reagents required for ... negative control cells for assessing reagent performance; ... individual steps in the assay; terminal deoxynucleotidyl ...
... The BioGenex VISION Sytem is a ... comes with proprietary digital imaging and ... digital image acquisition, analysis, archving/retrieval and ... comes with the industry's fastest scanning ...
... PowerPac HV high-voltage power supply, with temperature probe, ... of 5,000 V, 500 mA, and 400 W. ... temperature between 0 and 90 degrees C during ... transfer. Power cord and instructions are provided. Dimensions ...
Biology Products: