Navigation Links
Chromosome inheritance? Not the same for all the chromosomes
Date:10/7/2011

New findings of researchers from the University of Modena and Reggio Emilia (Mauro Mandrioli, Valentina Monti and Gian Carlo Manicardi) show that in aphids the two X chromosomes have a different inheritance. The study was published in Comparative Cytogenetics.

Aphids are insects with a sex determination model based on the presence of two X chromosomes (XX) in females and a single X chromosome (XO) in males. Previous studies suggested that X chromosome loss during male determination was random and that both X chromosomes have the same probability to be inherited in males. On the contrary, some authors suggested the presence of strong biases in the transmission of sex chromosomes, so that X chromosomes may have a non-mendelian inheritance in aphids.

On the basis of the results obtained in potato aphid Macrosiphum euphorbiae, we suggest the presence of a non-random elimination of one X chromosome during the male determination process. In particular, the unequal distribution of ribosomal DNA (rDNA) genes between the two X chromosomes could favour the loss of the X chromosome with fewer rDNA genes. This result is due to the fact that all the aphid eggs during the prophase present two X chromosomes linked by rDNA genes. However, in eggs developing as females, the connection is quickly lost, but in male generating eggs the X chromosomes remain attached by rDNA genes and undergo a sort of non-canonical reductional division, so that at the end of this peculiar division, the egg has one X chromosome only and it is determined as a male.

X chromosomes with few rDNA genes seem to be less sticky that X chromosomes with larger rDNA regions, so that their inheritance is not random and X chromosomes with few rDNA genes may be lost and not inherited in males. Mutations in the chromosome structure could therefore affect chromosomal inh
'/>"/>

Contact: Mauro Mandrioli
mauro.mandrioli@unimo.it
39-059-205-5544
Pensoft Publishers
Source:Eurekalert

Page: 1 2

Related biology news :

1. New thinking on regulation of sex chromosomes in fruit flies
2. The machinery for recombination is part of the chromosome structure
3. How yeast chromosomes avoid the bad breaks
4. Discovering the bigger picture in chromosomes
5. Kinetochores prefer the silent DNA sections of the chromosome
6. Could ovarian stimulation cause an increase in oocyte chromosome abnormalities?
7. New insight into chromosome segregation: Centromere-independent kinetochore assembly
8. Study in roundworm chromosomes may offer new clues to tumor genome development
9. Research into chromosome replication reveals details of heredity dynamics
10. Finger-trap tension stabilizes cells chromosome-separating machinery
11. Chromosome imbalances lead to predictable plant defects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/12/2015)... , Aug. 12, 2015  New research ... can attack Android phones to steal users, fingerprints. ... increasing availability of fingerprint scanners on mobile devices, ... concern. To secure biometrics on mobile devices, HYPR ... augment these convenient authentication systems with strong cryptographic ...
(Date:8/6/2015)... CITY, Calif. , Aug. 6, 2015 /PRNewswire/ ... Valley) will visit Crossmatch ™ to learn ... networks and protect data. Crossmatch is a world ... whose technologies and expertise are helping federal agencies ... efficiency and security.   "The vast ...
(Date:8/5/2015)... VIEW, Calif. , Aug. 5, 2015 ... exhibits continuous growth in applications, penetration into newer sectors, ... after year. The global biosensors space has seen the ... exited the market so far. (Photo - ... Frost & Sullivan, Analysis of the Global Biosensors ...
Breaking Biology News(10 mins):HYPR Corp. Addresses Android Vulnerability That Exposes Ecosystem-wide Biometric Security Challenges 2HYPR Corp. Addresses Android Vulnerability That Exposes Ecosystem-wide Biometric Security Challenges 3Rep. Honda to Visit Crossmatch in Redwood City 2Innovative Biosensors Incite Use in Non-Traditional Applications 2Innovative Biosensors Incite Use in Non-Traditional Applications 3Innovative Biosensors Incite Use in Non-Traditional Applications 4
... A study led by researchers from Universitat Autnoma de Barcelona ... populations control the way they spread over the surface of ... presence of an antibiotic, only to resume again when the ... RecA protein, which significantly increases its concentration at the start ...
... in San Diego, picked up a copy of the Los Angeles ... on the wildfires in the western United States. The wildfires, ... years instead of every few decades and they are burning ... cheatgrass (Bromus tectorum), an invasive plant that is rapidly displacing native ...
... 2010 -- With the signing of a memorandum of ... 20 planned core ecological observatory sites that will provide ... ecosystem breathes. The agreement between the Department of ... Walker Branch Watershed portion of the $434 million project ...
Cached Biology News:Discovery of controlled swarm in bacteria 2In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin' 2In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin' 3In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin' 4In elevated carbon dioxide, soybeans stumble but cheatgrass keeps on truckin' 5DOE, ORNL officially join NSF on massive ecological study 2
(Date:9/3/2015)... ... September 03, 2015 , ... Michigan-based technology startup ... early 2016. , The device, called the Halo H1, is a wearable ... sensing technology. These sensors track trending interstitial fluid levels in the body, in ...
(Date:9/2/2015)... 2015 Axovant Sciences Ltd. (NYSE:  AXON), a leading ... announced upcoming presentations at three investor conferences: , ... Healthcare Conference in New York at ... at 2:00 PM at the BioCentury NewsMakers Conference in ... & Conference Center , Thursday, September 17 at 9:30 ...
(Date:9/2/2015)... ... September 02, 2015 , ... ... compliance, quality systems, analytical testing, education and consulting services for the medical ... medical device products/processes development, design control, validation, quality assurance and regulatory compliance. ...
(Date:9/2/2015)... Research and Markets ... Jain PharmaBiotech,s new report "Biochips and Microarrays ... offering. This report is an analysis ... The report starts with a description of technologies ... include array comparative genomic hybridization (CGH), copy number ...
Breaking Biology Technology:Technology Startup Halo Wearables to Unveil Non-Invasive Hydration Monitoring Device Early 2016 2Axovant Sciences To Present At Upcoming Investor Conferences 2Axovant Sciences To Present At Upcoming Investor Conferences 3NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 2NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 3NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 4NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 5NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 6NSF International Strengthens Medical Device Consulting With Acquisition of Avarent LLC 7Global Biochips and Microarrays Technologies, Markets and Companies Report 2015 with Market Size in 2014 and Projected Value for the Years 2019 and 2024 2
... company adds new apoAI measurement and apoB/apoAI ratio to ... March 17 /PRNewswire/ -- Atherotech, ... Cholesterol Test in booth #1263 at ACC.09, the American ... The annual meeting takes place March 29-31, 2009, at ...
... Mass., March 17 The pro bono healthcare ... ), has announced that its newly instituted Safe ... Lutheran Health System of La Crosse, Wisconsin. The ... outstanding accomplishments in safe patient handling, safe lifting, ...
... March 17 Cardiorobotics, Inc., a ... use in a wide range of applications, including: ... appointment of Dr. Samuel Straface in the position ... that Dr. Straface has joined Cardiorobotics in this ...
Cached Biology Technology:Atherotech to Exhibit the VAP(R) Cholesterol Test at ACC.09 in Orlando 2Atherotech to Exhibit the VAP(R) Cholesterol Test at ACC.09 in Orlando 3Gundersen Lutheran Health System is Recognized for Safe Lifting Leadership 2Gundersen Lutheran Health System is Recognized for Safe Lifting Leadership 3Cardiorobotics Announces New CEO, PLSG Executive-in-Residence to Lead Company 2Cardiorobotics Announces New CEO, PLSG Executive-in-Residence to Lead Company 3