Would a different sperm make a different baby?

Neither. Each sperm carries a unique “half DNA” with some mutations (some positive, some negative, and some neutral, depending on the environment). So they represent entirely different half people. It's the same principle with the eggs they could combine with to form an entirely different, full person.


Does different sperm mean a different baby?

Identical twins have the same genetic material, but as you can see, every egg they both make is different. Every sperm a man makes is different. Hence the chances of their babies being identical are pretty close to zero.

Can 2 different sperm fertilize 1 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.


Do different sperm carry different genes?

Each sperm cell contains half the father's DNA. But it's not identical from sperm to sperm because each man is a mixture of the genetic material from his parents, and each time a slightly different assortment of that full DNA set gets divided to go into a sperm.

Does it matter which sperm fertilizes the egg?

There is ample evidence to show that as millions of human sperm cells swim towards a waiting ovum or egg, only one gets to fertilize it.


5 tips to ensure healthy sperm - Jesse Mills, MD | UCLA Health Newsroom



What age is sperm most fertile?

Another study that evaluated the relationship between age and semen parameters also concluded that male fertility decline begins at 35, and suggested that male fertility peaks between 30 and 35. Bottom line: Men generally see a decrease in fertility beginning at 35, and the decline progresses from there.

What determines which sperm goes into the egg?

Human eggs use chemical signals to attract sperm. New research from Stockholm University, Manchester University NHS Foundation Trust and The University of Manchester shows that eggs use these chemical signals to “choose” sperm. Different women's eggs attract different men's sperm – and not necessarily their partners..

Can a baby have two biological fathers?

Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring.


What genes do fathers pass on?

All men inherit a Y chromosome from their father, which means all traits that are only found on the Y chromosome come from dad, not mom. The Supporting Evidence: Y-linked traits follow a clear paternal lineage.

Whose genes are stronger mom or dad?

Genetically, you actually carry more of your mother's genes than your father's. That's because of little organelles that live within your cells, the mitochondria, which you only receive from your mother.

What happens if two sperm penetrate a single egg?

If more than one sperm fuses—a condition called polyspermy—multipolar or extra mitotic spindles are formed, resulting in faulty segregation of chromosomes during cell division; nondiploid cells are produced, and development usually stops. Two mechanisms can operate to ensure that only one sperm fertilizes the egg.


Which parent decides twins?

However, for a given pregnancy, only the mother's genetics matter. Fraternal twins happen when two eggs are simultaneously fertilized instead of just one. A father's genes can't make a woman release two eggs.

Does the sperm or egg determine gender?

These are known as the sex chromosomes. Every egg has an X sex chromosome; a sperm can have either an X or a Y sex chromosome. If the sperm that fertilizes an egg has an X chromosome, the baby is female; if it has a Y chromosome, the baby will be a boy.

Can a baby look like someone who is not the father?

Sometimes children end up looking exactly like one parent, or even closely mirroring a sibling, and sometimes they don't resemble anyone in the family. It's all entirely possible. Kids share 50% of their DNA with each of their parents and siblings, so there's plenty of room for variation.


Can you influence baby gender?

Dr Michael Thomas MD (fertility specialist) actually advises that there are no methods to affect the sex of your child, including sexual position.

What determines the looks of a baby?

Babies inherit multiple pairs of genes from each parent that play a role in appearance. These genes determine hair color as well as eye color and complexion. And although scientists have yet to determine how many genes ultimately determine the exact color of a child's hair, they do understand how the process works.

Do babies always have the father's blood type?

No it doesn't. Neither of your parents has to have the same blood type as you. For example if one of your parents was AB+ and the other was O+, they could only have A and B kids. In other words, most likely none of their kids would share either parent's blood type.


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.

Can a baby have 2 dads and one mom?

It may be possible for stem cells from a male to be used to produce an egg, allowing for the child to have two biological fathers. Primordial germ cells (PGCs) are stem cells that give rise to sperm or egg cells.

How can you tell who the father of your baby is?

A DNA paternity test is nearly 100% accurate at determining whether a man is another person's biological father. DNA tests can use cheek swabs or blood tests. You must have the test done in a medical setting if you need results for legal reasons. Prenatal paternity tests can determine fatherhood during pregnancy.


Can a baby have 3 fathers?

Sure. But maybe not that far in the future. Recently, researchers with the Institute of Life in Athens, Greece, announced that a healthy baby boy was born who basically had the DNA from three people. The child was born to a 32-year-old woman who had failed in four cycles of in vitro fertilization (IVF).

Which sperm wins the race?

We often have heard that sperm from semen race towards the egg to enable fertilisation, with the fastest and fittest sperm winning the lottery. However, a study from 2020 highlighted that it isn't the sperm that rushes to claim its first position, it's in fact the egg that chooses which one gets to win.

Does the egg reject the sperm?

Researchers from Stockholm University and the Manchester University NHS Foundation Trust found that the egg effectively chooses the sperm it wants, and rejects the others. "Human eggs release chemicals called chemoattractants that attract sperm to unfertilised eggs.


Is the first sperm the strongest?

Summary: Sperm in the first fraction of ejaculate are more numerous, move more and present better quality DNA than those lagging behind.

How long are guys fertile?

Men can produce sperm from puberty to a ripe old age and continue to father children as long as they do so. Women, on the other hand, have a limited fertile window. Past 51 – the average age of menopause – they cease to release any eggs and become infertile. Both men and women are delaying having children.
Previous question
Is anger a mental state?