How are twins formed?
Twins, where one twin is a boy and the other is a girl, are biologically called fraternal twins. In recent years, with the advancement of reproductive technology and people's attention to the phenomenon of twins, the formation mechanism of twins has become a hot topic. This article will analyze the formation principles, influencing factors and related data of twins based on the hot content on the Internet in the past 10 days.
1. The formation principle of dragon and phoenix twins
The formation of twins is closely related to the type of twins. Twins are divided into two types: identical twins and fraternal twins:
| twin type | Formation mechanism | gender combination |
|---|---|---|
| Identical twins | A single fertilized egg divides into two embryos | Same sex (male or female) |
| fraternal twins | Two eggs combine with two sperms | Same or opposite sex (dragon and phoenix) |
Twins are fraternal twins, and their formation requires two eggs to be released at the same time and combined with sperm carrying X and Y chromosomes respectively. Therefore, the gender combination of twins is "one boy and one girl".
2. Factors affecting the formation of twins
According to the recent hot topic about fertility on the Internet, the following factors may increase the probability of twins:
| factors | Description | scientific basis |
|---|---|---|
| genetic factors | A family history of fraternal twins | The mother carries the polyovulatory gene |
| Childbirth at advanced age | Female age>35 years old | Changes in hormone levels lead to multiple ovulations |
| assisted reproductive technology | Such as in vitro fertilization (IVF) | Multiple embryo transfer increases the probability of fraternal eggs |
| Regional differences | Parts of Africa have a higher probability of | May be related to eating habits |
3. Recent hot discussions on twins of twins
1.The impact of gene editing technology: Some netizens are hotly discussing whether CRISPR technology can artificially create twins, but the current ethical and technical limitations are still controversial.
2.Case of celebrity twins: A well-known artist recently gave birth to twins, a twin and a twin, triggering a discussion on social media about "twin parenting tips."
3.Adjustments to family planning policies: With the opening of the three-child policy, many places have reported that "the proportion of families with twins has increased", but there is no authoritative data to support this.
4. Global statistics of twins
According to the International Society for Twin Research (ISTR) 2023 report:
| area | Probability of fraternal twins | Ratio of twins and twins |
|---|---|---|
| global average | 1.1% | about 25% |
| nigeria | 4.5% | about 28% |
| China | 0.8% | about 22% |
| USA | 3.2% | about 26% |
5. New progress in scientific research on twins
1.Epigenetic discoveries: In June 2023, a sub-journal of "Nature" pointed out that there were significant differences in the methylation patterns of twin embryos.
2.AI prediction model: A domestic team developed an algorithm to predict the probability of fraternal twins based on maternal hormone levels, with an accuracy of 78%.
3.placental research: The latest research shows that the placental blood vessel distribution pattern of twins may affect fetal development differences.
Conclusion
The formation of twins is a wonderful phenomenon in natural reproduction. It has a genetic basis and is also affected by environmental factors. With the advancement of science and technology, mankind's understanding of the mechanism of twins continues to deepen, but ethical boundaries still need to be treated with caution. Future research may reveal more secrets about the origin of life.
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