Tag: "fathers" at biology news

High Testosterone Level May Lead Male Junco To Stray From Mate

... samplefrom the fledgling birds to determine their fathers through DNA fingerprinting. The results showed: Normal males had significantly more young that survived to leave the nest (an average of 3.9 fledglings) than did high-testosterone males (2.7 fledglings). That may be because normal males provid...

A Mother's Love? New UD Theory Explains Why Good Insect Moms Risk Death To Save Their Only Children

...care costs. Bug dads Ever wonder how many insect fathers pitch in with child-care? Not many, Tallamysays: "Paternal care occurs only among three families of true bugs"( Hemiptera ). After all, male insects have no way of knowing whether theyfathered a particular clutch, and they can reproduce indefinitely....

Alcoholics' Children: Living With A Stacked Biochemical Deck

...ily historyof chronic drinking -- all had at least fathers who were alcoholics -- with 22counterparts who had no such history. The scientists indirectly measured opioidactivity in the brain by artificially blocking opioids in both groups with adrug called naloxone and then measuring the "downstream" effect ...

Fathers pass infertility to sons

...nherit the same geneticdefects that rendered their fathers infertile. HHMI investigator <AHREF="http://w...toplasmic sperm injection(ICSI). In each case, the fathers passed on a Y chromosome genetic defect calledan AZFc deletion. Such deletions are the most frequent...

University of Georgia professor writes first book on phylogeography--a field of study that he helped found

...Avise. "Just as sons and daughters `inherit' their fathers non-recombined surname [before recent rule changes in some families], so too do progeny normally receive non-recombined mtDNA from their mothers. Furthermore, much the same way that mutations sometimes arise in surnames [my own name was a 19th centur...

University of Pittsburgh researchers uncover mitochondrial defect involved with inherited cancers

...both mothers and fathers, tumors develop only when fathers transmit the defect. The researchers found that a...genomic imprinting" mechanisms to explain why only fathers transmit this tumor, said Dr. Baysal. ...

Gene tug-of-war leads to distinct species

... a parental "tug-of-war." According to the theory, fathers contribute genes that enhance growth because their best interests are served if their progeny extract as many maternal resources as possible in order to ensure survival. Mothers, on the other hand, then silence their copy of growth-promoting genes in...

Mum versus Dad

... such as these are thought to have evolved because fathers want big babies that hog nutrients, especially if ...e womb space with siblings that may have different fathers -- a common phenomenon in primitive mammals. "Half the shrews near Oxford carry biparental litters,"...

New research highlights concerns over children born through donor insemination

...and many had recourse to fantasy about their donor fathers as a coping strategy." But although the informatio...se of abandonment of responsibility by their donor fathers and the medical profession. They expressed a need and a right to know who their donor fathers are an...

Offspring of men with birth defects twice as likely to have defects, too

...with birth defects. However, the children of fathers with birth defects also had a higher risk of havin...rth defects was 5.1 percent among the offspring of fathers with defects, or twice the 2.1 percent risk of the offspring of other fathers. The risk was spread ...

The masculinization of the X chromosome: many genes for early male sperm production reside on the X chromosome

...ow sperm count can be inherited by sons from their fathers when infertile fathers use intracytoplasmic sperm injection (ICSI) to have children. "Now it appears that we may face the...

Older fathers substantially raise the risk of having children with schizophrenia

...age. Think again. A new study now shows that older fathers are far more likely to have children with schizoph...ases could be attributed to the dad's age. And for fathers over the age of 50, two out of three cases of schizophrenia among their children could be attributed...

Older fathers more likely to have children with schizophrenia

New York, NY - April 9, 2001-- Older fathers are much more likely to have children with schizop...ding extends a growing body of evidence that older fathers are more likely to have children with a wide variety of gene-influenced illnesses. Advancing paterna...

BioMed Central is pleased to announce the publication of Sydney Brenners autobiography

...llow him from his modest beginnings, living in his fathers shoe shop in South Africa, to the heights as director of the MRC Laboratory of Molecular Biology in Cambridge, England and beyond. This entertaining account captures the essence of a renowned scientist and captivating raconteur who has achieved so...

Father's play the key role in transmitting

...les that was most pronounced when transmitted from fathers to affected daughters. In TlDM patients, the ...ound significantly more often to be transmitted by fathers than by mothers to affected offspring (p=0.005) mainly due to a preferential transmission of DQ8 by ...

Men with higher levels of PCBs more likely to father boys

...milies in which PCB levels were detectable in both fathers and mothers. This was a total of 208 children from 101 families. They found that men with PCB concentrations of at least 8.1 micrograms per liter of blood were more likely to father boys. "However," Karmaus said, "we did not detect that the PCB lev...

Water lily may provide a 'missing link' in the evolution of flowering plants

...h chromosome: two from the mother and one from the fathers sperm. This triploid endosperm contrasts dramatically with the seeds of gymnosperms, in which the nourishing tissue is haploid containing a single copy of each chromosome. The question of how endosperm originated, in an evolutionary sense, has perp...

Battle of the sexes leads to evolutionary arms race

...tionary consequences of females searching for good fathers for their offspring." The key to their research lies in the fact that males and females play very different roles in reproduction. What is best for one sex is rarely best for the other, leading to a range of sexual conflicts, says Rowe. "Males of mos...

Battle of the sexes leads to a biological arms race

...tionally been explained by females search for good fathers for their offspring. A new and quite different explanation is instead based on different and fundamental conflicts of interest between the sexes. Males and females play different roles in reproduction. What is best for one sex is therefore rarely be...

Osteoarthritis and genetic link

...cipants and 793 of their offspring, including both fathers and mothers, both sons and daughters. The average age was 62 for the parents and 54 for the children. Fifty percent of the original participants and 30% of their offspring had at least one hand joint affected by OA. Using the established Kellgren...

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