Male Fetus
The X and Y chromosomes play a role in differentiating the female and male fetus from the undifferentiated zygote. Here, the male fetus has XY chromosomes as its allosomes. During the second trimester, there is a protrusion observed between the legs of the male fetus. The protrusion confirms a developing male penis. This observation is done through ultrasound scanning. Also, the amniotic fluid can be analysed for the presence of testosterone. But this hormonal analysis is subject to change as both female and male fetuses can produce testosterone.
Female Fetus
The female fetus has two X chromosomes as its allosomes. Also, characteristic parallel lines are observed between the legs instead of protrusion. This corresponds to the developing labia and clitoris of the female. Sometimes, the fetal ovary is also capable of producing a hormone called estrogen.
Difference between Male and Female Fetus
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Male Fetus |
Female Fetus |
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Definition |
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The term refers to an unborn male offspring. |
The term refers to an unborn female offspring. |
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Karyotyping |
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Male fetal karyotyping shows XY allosomes. |
Female fetal karyotyping shows XX allosomes. |
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Ultrasound |
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A protrusion is observed between the legs of the male fetus, which is the developing penis. |
Parallel lines are observed between the legs that later develop into labia and clitoris. |
Frequently Asked Questions on Difference between Male and Female Fetus
What is sex determination?
It is a biological determination of the developing sex. Chromosomes, hormones and other sexual characteristics are considered for sex determination.
What is karyotyping?
It is an examination of a complete set of chromosomes, especially during the metaphase stage. It determines the number of chromosomes and also the abnormalities in them.
What is prenatal ultrasound?
It is a medical ultrasonography examination that is specially done during pregnancy. Ultrasound uses sound waves to create visual impressions of the developing fetus.
Further Reading:
- Sex Determination
- Male and Female Reproductive System
- Difference between Male and Female Heterogamety
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