What Are Fraternal Twins?

Fraternal twins have two eggs that combine with two sperm when they conceive, and then develop into two independent individuals. After growing up, the differences are relatively large, and they can be homosexual or heterosexual. Developed by combining two (or more) egg cells with two (or more) different sperm at the same time or in succession.

Fraternal twins

Fraternal twins have two eggs that combine with two sperm when they conceive, and then develop into two independent individuals. After growing up, the differences are relatively large, and they can be the same or different. Developed by combining two (or more) egg cells with two (or more) different sperm at the same time or in succession.

They have separate membranes, placenta, and umbilical cord during development. Heterozygosity is because the mother's ovaries release two eggs at the same time, and they are fertilized into a fetus.

Chinese name

Fraternal twins

Foreign name

Fraternal twins

Form

Egg cells bind to two different sperm at the same time

Device officer

Separate membrane, placenta and umbilical cord

Odds

Approximately 3 for every 1,000 babies born

Missing point

Twin pregnancy at high risk

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Fraternal twins can be the same sex or different sexes. Because fraternal twins are produced by multiple ovulation, their number has been higher in recent years, especially due to the increase in the use of fertility drugs, which has led to multiple ovulation. Approximately four out of every 1,000 babies born are identical twins. However, fraternal twins occur at different rates in different ethnic groups and at different maternal ages. Young women (under 20) rarely have fraternal twins (about 3 per 1,000 babies born), while women aged 35 to 40 have 14 fraternal twins per 1,000 babies born . Asians rarely have fraternal twins, and blacks have the most.

In any sense, twin pregnancies carry a high risk. Fraternal twins seem to be more robust than identical twins because each fraternal twin has its own placenta and cannot "steal" nutrition from another twin (since identical twins may sometimes share part of the placenta). Most often, fraternal twins are different

In March 2015, a pair of fraternal twins were found in the United Kingdom. They were 18-year-old Lucy Elmer and Maria Elmer, both from Gloucester, England. Lucy had fair skin and yellow hair, and Maria has dark skin and curly hair. Obviously they are a white man and a black man, but they are twin sisters, specifically non-identical twins. Their mother, Donna, is of Jamaican origin, and their father, Vince, is white. The two girls were born in January 1997. Their mother was not informed of their daughters' different skin colors during the B-scan, so they were quite surprised when they saw them for the first time. Non-identical twins come from different eggs and therefore inherit different genes. ^[2]