Video: Scientists have discovered the similarity of the offspring with the first sexual partner of the female
2024 Author: Seth Attwood | [email protected]. Last modified: 2023-12-16 15:55
For the first time, biologists have demonstrated that a child is similar to the mother's previous sexual partner - at least in flies. This is almost the first fact that testifies in favor of telegony (the influence of the first partner on the heredity of all descendants of a female) - an idea that geneticists rejected at the beginning of the 20th century. The results of the study are presented in the reputable scientific journal Ecology Letters, and briefly described in a press release from the University of New South Wales.
Australian scientists obtained male flies of the correct size by placing them on a nutrient-rich (or poor) diet. Then they mated males of different - large and small - sizes with young females, and finally changed partners when the flies reached maturity. Although the fly produced offspring from a second male, the size of its children was determined by the diet of the first partner. The researchers believe this is due to the absorption of the first male's semen molecules by the immature female eggs.
“We know that many family traits are determined not only by genes that children inherit from their parents. Environmental factors affect offspring through a variety of non-genetic inheritance mechanisms. Our results open up a new level of this phenomenon: the male can pass on his traits to offspring born of another parent. However, we do not know if this mechanism works in other animals,”says lead author Angela Crean.
The concept of telegony dates back to Aristotle. The philosopher believed that the characteristics of an individual are inherited not only from his parents, but also from other males, from whom his mother had previous pregnancies. In the Middle Ages, this concept caused concern of the European aristocracy. At the turn of the 19th and 20th centuries, the belief in telegonia was widespread among breeders. According to the modern position of biologists, most of the facts that are cited as evidence of telegony are the appearance in offspring of characters that were absent from the parents, but were available from more distant ancestors.
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