15 doctors weighed in:

What determines the sex of the baby, the man's sperm or the woman's egg?

15 doctors weighed in
Dr. George Klauber
Pediatrics - Urology
7 doctors agree

In brief: Man's sperm

Woman's ova or eggs only carry the x sex determining chromosome amongst the 23 chromosomes.
Whereas sperm carry either an x or a y chromosome amongst their 23 chromosomes. When joined an embryo's cells contain 46 chromosomes. Xx = female, & xy = male. A sperm containing an x chromosome after impregnation results in a baby girl and a y chromosome containing sperm will produce a boy.

In brief: Man's sperm

Woman's ova or eggs only carry the x sex determining chromosome amongst the 23 chromosomes.
Whereas sperm carry either an x or a y chromosome amongst their 23 chromosomes. When joined an embryo's cells contain 46 chromosomes. Xx = female, & xy = male. A sperm containing an x chromosome after impregnation results in a baby girl and a y chromosome containing sperm will produce a boy.
Dr. George Klauber
Dr. George Klauber
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Dr. Arti Jain
Pediatrics
5 doctors agree

In brief: The man's sperm

The sex of a baby is determined by the two sex chromosomes inherited from the parents.
A baby will normally inherit one sex chromosome from the mother, and one from the father. A woman has two x chromosomes, so she can give either of her x chromosomes. The father can give either his x or y chromosome. A baby girl has 2 x chromosomes and a baby boy has 1 x and 1 y chromosome.

In brief: The man's sperm

The sex of a baby is determined by the two sex chromosomes inherited from the parents.
A baby will normally inherit one sex chromosome from the mother, and one from the father. A woman has two x chromosomes, so she can give either of her x chromosomes. The father can give either his x or y chromosome. A baby girl has 2 x chromosomes and a baby boy has 1 x and 1 y chromosome.
Dr. Arti Jain
Dr. Arti Jain
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Dr. Jay Nemiro
Fertility Medicine
1 doctor agrees

In brief: The father

Since a woman has two x chromosomes (46xx) and a man has an x and a y chromosome (46xy)- the woman can only contribute an x to the baby but the man can contribute an x or a y; therefore the man depends the sex of the child depending on which chromosome he contributes- x or y- if it is an x than the baby is a girl (46xx) and if it is a y, the baby is a boy (46xy).
Hope this helps.

In brief: The father

Since a woman has two x chromosomes (46xx) and a man has an x and a y chromosome (46xy)- the woman can only contribute an x to the baby but the man can contribute an x or a y; therefore the man depends the sex of the child depending on which chromosome he contributes- x or y- if it is an x than the baby is a girl (46xx) and if it is a y, the baby is a boy (46xy).
Hope this helps.
Dr. Jay Nemiro
Dr. Jay Nemiro
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