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A Handy Guide to Ancestry and Relationship DNA Tests

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Back to Chromosomes

Which parent decides whether a baby will be a boy or a girl?

-A curious adult from Great Britain

Neither parent gets to decide. Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl.
What we can say is that dad's sperm determines whether a baby will be 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.
In a perfect world, it would all be up to chance. Both types of sperm would have an equal chance of reaching the egg first. And once fertilized, each type of egg would have an equal chance of developing fully into a baby.
But as you know, the world is not perfect. Certain factors can influence the sex of the child. As you'll see below, there is much more evidence of this happening in the animal world but it happens in people too.
For example, more boys are born each year than girls. One theory for this has to do with the Y (or male) sex chromosome being so much smaller than the X (or female) one. The idea is that sperm that carry a Y are slightly speedier and so are a bit more likely to make it to the egg first.
How mom or dad lives can affect the sex of their baby too. A number of studies have suggested that factors like nutrition, wealth, and even where the parents live can affect the odds of having a boy or a girl. But none of these effects is very large.
For example, moms that ate cereal every morning had a boy 59% of the time while moms that rarely ate cereal had boys only 43% of the time. However, this doesn't mean that you should change your diet to increase your odds either way.
We don't know for certain that cereal is the cause of the difference. Perhaps women who tend to eat cereal have other shared qualities and it's one of these that affects whether they'll have a boy or not. And as you can see, whatever the reason the effect is tiny.
This is true of most outside factors like this in people. For us the sex of the child is mostly determined by which of dad's sperm makes it to the egg first.
Let's look a little closer at how the X and Y chromosomes determine sex. Then we'll explore why we see differences in the numbers of girls and boys in many families.
X (or Y) Marks the Gender
Both men and women have sex chromosomes. Men usually have one X and one Y chromosome, while women have two X's.
When an egg or sperm is made, it only gets one of the sex chromosomes from the parent. This means that women can only make eggs with an X chromosome. But men can make either X or Y sperm.
During fertilization, the sperm cells race toward the mother-to-be's egg cell. If a sperm with a Y beats all others, then the fetus will be XY. The pregnancy will result in a boy.
However, if a sperm with an X wins the race to the egg, then the fetus will be XX. The parents will have a baby girl.
Nearly everyone's chances are around 50% for having a boy and 50% for having a girl. And yet, we all know families that are all boys or all girls.
Too Many Brothers (or Sisters)
Having all boys or all girls is almost always due to simple chance. It is only rarely that parents have one sex more often than another for some underlying biological reason.
You've probably flipped a coin to make a decision between two things before. When you flip a coin, you have a 50% chance for heads and a 50% chance for tails. These are about the same odds as having a boy or a girl.
What if you flip a coin ten times and get heads every time? What are the odds for heads on the next coin flip? Still 50%.
In a coin flip, it doesn't matter what came before. This is because the coin can't remember what was previously flipped.
The same thing is true in having a boy or a girl. Mom's body can't remember what sex the previous child was. So the chance of one child being a boy or girl is independent of any other child’s gender in the family.
It's just a matter of which type of sperm happens to reach the egg first. In families that have all boys or all girls, it turned out to be the same one each time. And if they decide to have another child, the chances are 50-50 that the baby will be a girl versus a boy.
In the real world, though, more than chance is involved. As we talked about earlier, other factors can affect which sperm makes it to the egg and whether the fertilized egg goes on to be a healthy baby.
Most factors in people are thought to be very small though. Remember how we said that more boys are born than girls because of the speedier boy sperm? Well the difference is actually not that big...51% of all newborns in the U.S. are boys.
However, the animal world is a whole different story. All sorts of things can happen so that more boys are born than girls and vice versa.

Animals with Wacky Sex Ratios

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The Chancellor’s Recognition Ceremony for December Degree Candidates

Saturday, December 8, 2018 10:00 a.m. Athletic Complex, Danforth Campus

Reception Immediately Following

Please remember that tickets are not required for the December Recognition Ceremony.

Invitations will be emailed to all December degree candidates and RSVPs are requested. Family and guests are welcome.

Olin Business School will host a recognition ceremony for candidates receiving business degrees at 2 p.m. on Saturday, December 8 in Graham Chapel. December degree candidates in business and their guests are invited to participate in both ceremonies. More details.

Olin Business School
9:00 a.m. 9:30 a.m. 10:00 a.m. 11:00 a.m.

By 9:30 a.m., all candidates must be in the Athletic Complex to pick up their name card and line up at the assembly point

The grand marshal will announce the names of each candidate as they walk across the stage to shake hands with Chancellor Wrighton.

Regalia should be ordered by November 15. Candidates can pickup regalia at the Danforth Campus Bookstorestarting the Monday before the ceremony. (Note, regalia for the May ceremonywill be available at a discounted price for those candidates attending both December and May ceremonies.)

In addition, candidates and their families can also order graduation announcements at the bookstore.

Undergraduate students: Your tassel should be worn on the right side while wearing your cap.

Order regalia and announcements

The ceremony will be streamed on the Commencement homepage .

Parking is available in the Danforth University Center underground parking garage and Snow Way parking garage. A drop off zone will be available on the surface lot east of the Athletic Complex. This lot will also be reserved for those needing accessible parking. Coco De Mer Pamela Loves Lucky Suspender Belt High Quality Mtfcv

An American Sign Language interpreter will be present during the Recognition Ceremony. For guests needing wheelchairs, a limited number are available by reservation before Nov. 28 by contacting Rosetta Saputo in Resource Management at 314-935-5669 or Dorothy Perkins Womens Paisley Print Mini Skirt Outlet Sale HfKfaB1JeK

Place your order today for a graduation bouquet. Flowers will be available for pickup at the ceremony.

Help celebrate the December graduates by sharing your tweets, photos, and videos using the hashtag #WashU17.

All students graduating in December are invited to return to Commencement in May. Details will be provided with your diploma.

If you successfully complete all degree requirements, your degree will be officially conferred by the Chancellor and the Board of Trustees in January. Diplomas will be mailed at the end of January and may take several weeks to arrive.


December Recognition Dates: Saturday, December 8, 2018 Saturday, December 14, 2019 Saturday, December 12, 2020

Campus Box 1179

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