Can a boy and girl be born at the same time?

This is a very rare birth of twins—a boy and a girl—from a single fresh compaction-morula produced by ICSI. We had to examine why there were two babies of different sex, which meant that it was a dizygotic twin pregnancy.

Can different gender twins be identical?

In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair.

How common is it to have a boy and a girl?

When I tell patients there's about a 50/50 chance for either sex, I also tell them the father's genes determine the baby's sex since some of his sperm carries X chromosomes and some carries Y chromosomes. That's with the assumption, though, that the man's sperm carries equal numbers of X and Y chromosomes.

How common is it to have a boy and girl twin?

Mixed-gender twins are the most common type of fraternals, some 50 percent are boy-girl.

What happens if twins have a baby together?

Science has shown if 2 sets of identical twins have kids, the kids will be genetic brother/sisters of each other. If you somehow had 2 identical twins (not fraternal) that could produce a baby. The offspring would be a clone of the parents. It would be a genetically identical clone.

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Can twins be half siblings?

Homopaternal superfecundation is fertilization of two separate ova from the same father, leading to fraternal twins, while heteropaternal superfecundation is a form of atypical twinning where, genetically, the twins are half siblings – sharing the same mother, but with different fathers.

What happens if siblings have a kid?

The risk for passing down a genetic disease is much higher for siblings than first cousins. To be more specific, two siblings who have kids together have a higher chance of passing on a recessive disease to their kids.

Which parent determines gender?

What we can say is that dad's sperm determines whether a baby will be born as a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first.

What causes twin boy and girl?

Girl-boy twins occur when one X egg is fertilized with an X sperm, and a Y sperm fertilizes the other X egg. Sometimes health care professionals identify same-sex twins as fraternal or identical based on ultrasound findings or by examining the membranes at the time of delivery.

Can twins have different fathers?

But you may be left wondering: Can twins have different fathers? The answer is yes, but only in cases in which they're fraternal, as identical twins form from a single egg/sperm combination and thus cannot have different fathers.

What is it called when you have a boy and girl?

A hermaphrodite is a person (or plant or animal) that has both male and female sexual organs. Hermaphrodites are rare. This is an unusual word for an unusual condition: being a boy and a girl at the same time. This happens to a small number of people who have the reproductive organs of both men and women.

What month are most boys born?

They found that the most fertile months for conceiving a boy were from September to November, while the lowest fertile period was from March to May.

Can 2 sperm fertilize the same egg?

Occasionally, two sperm are known to fertilize a single egg; this 'double fertilization' is thought to happen in about 1% of human conceptions. An embryo created this way doesn't usually survive, but a few cases are known to have made it — these children are chimaeras of cells with X and Y chromosomes.

Can one baby have two fathers DNA?

Although this is quite rare it can happen and it's called superfetation. Two babies are conceived from separate acts in two different cycles. These babies can be from the same father or two different men. When heteropaternal superfecundation occurs, the babies are from different fathers.

What are mixed gender twins called?

Fraternal twins are often the type of twins that have different genders. However, dizygotic twins may only share about 50% identical DNA, so generally, some characteristics might turn out alike.

Which parent causes twins?

For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother's genetics, not the father's.

Who carries the gene for twins?

The quick answer to this question is that, in a twin pregnancy, it is the mother's genes that determine twins. First up, giving birth to identical twins is not genetic, but conceiving fraternal twins is. The mother may have the genetic trait of releasing two eggs in one menstrual cycle.

Which parent determines eye color?

Each parent will pass one copy of their eye color gene to their child. In this case, the mom will always pass B and the dad will always pass b. This means all of their kids will be Bb and have brown eyes. Each child will show the mom's dominant trait.

How many children can a man have?

Since men require less time and fewer resources to have kids, the most "prolific" fathers today can have up to about 200 children. The number of children men can have depends on the health of their sperm and other factors like how many women they can reproduce with.

Which gender is more common at birth?

We might expect that naturally an equal number of boys and girls are born, but this is not the case. There are biological reasons why more boys than girls are born each year: around 105 boys per 100 girls. But in countries with a strong son preference, the sex ratio is even more skewed.

What is it called when 2 family members have a baby?

Consanguinity: Two people related by blood, that have a child You will need to consider the question of a possible genetic disease, specifically autosomal recessive and multifactorial diseases, depending up how closely related the parents were. References.

Can a brother and sister have a normal kid?

The simple, clinical answer to the question is: Yes. A brother and sister can have a perfectly healthy child together. Children born of incestuous couplings do have an increased risk of presenting genetic defects and/or deformities. But the increased risk is negligible with first generation inbreeding.

What is it called when a brother and sister get together?

History. While cousin marriage is legal in most countries, and avunculate marriage is legal in several, sexual relations between siblings are considered incestuous almost universally. Sibling incest is legally prohibited in most countries worldwide.