Can a yy person exist?

No, a human with only YY chromosomes cannot exist because the X chromosome carries essential genes for survival, so an embryo with just YY chromosomes (lacking an X) would not develop and would miscarry very early; however, a similar-sounding condition, XYY syndrome, where a male has an extra Y chromosome (XYY), does exist and is known as Jacob's Syndrome, leading to taller stature and potential learning challenges but typically normal development.
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Can a human be yy?

Each person receives one sex chromosome from each parent. The combinations can be XX (which results in a female) or XY (which results in a male). A YY combination cannot occur naturally because there are no mechanisms for two Y chromosomes to be together without an X chromosome.
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What are yy people?

47,XYY syndrome is characterized by an extra copy of the Y chromosome in each of an individual's cells. Although many people with this condition are taller than average, the chromosomal change sometimes causes no unusual physical features.
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Has an XY person ever given birth?

For reasons we don't understand, on very rare occasions, an XY female does have a uterus. But she still needs a donated egg, since she can't make one herself (no ovaries). There are a handful of cases where individuals with a Y chromosome, a uterus, and a donated egg have become pregnant and given birth to a child.
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Is it possible to get two Y chromosomes?

Yes, a person can have two Y chromosomes, a condition known as 47,XYY syndrome (or Jacobs Syndrome), where males have an extra Y chromosome, resulting in cells with 47 chromosomes (XYY) instead of the usual 46 (XY). This occurs from a random error in cell division (nondisjunction) during sperm formation, leading to some sperm carrying an extra Y. While often mild or undiagnosed, it's associated with taller stature, learning/speech delays, and behavioral issues, though many have normal lives and fertility.
 
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The myth of the "supermale" and the extra Y chromosome

What serial killers have XYY syndrome?

STUDIES SOON BEGAN TO APPEAR, AND IT WAS LATER DISCOVERED THAT SOME OF SOCIETY'S MOST NOTORIOUS MURDERERS (E.G., ROBERT PETER TAIT, DANIEL HUGON, JOHN FARLEY) HAD THE EXTRA Y CHROMOSOME.
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Are XYY males aggressive?

The analysis of all the studies proves that there are no statistical evidence that a 47,XYY man is predisposed to aggressive and deviant behavior. The presence of an extra Y can be considered only a genetic substrate, which cannot be the only cause of deviant behaviors.
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Did Jesus have xy chromosomes?

Yes, since Jesus was a fully human male, Christian theology holds he had XY chromosomes, with the Y chromosome miraculously provided by God the Father, not an earthly father, to fulfill the virgin birth narrative while maintaining his maleness and unique divine-human nature. This divine creation of the Y chromosome, along with other paternal DNA, explains how he could be both fully man and the Son of God without a human father. 
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Can an xy female menstruate?

46,XY pure gonadal dysgenesis (Swyer syndrome) is characterized by normal female genitalia at birth. It usually first becomes apparent in adolescence with delayed puberty and amenorrhea. Rarely, patients can present with spontaneous breast development and/or menstruation.
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Can xxy be female?

Yes, while XXY (Klinefelter syndrome) typically results in males, it's possible for individuals with an XXY karyotype to be phenotypically female or identify as female due to variations in sex-determining gene expression, often involving the SRY gene or androgen insensitivity, leading to intersex traits or complete female development. 
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Are there yy males?

Boys typically have one X chromosome and one Y chromosome, or XY, but boys with XYY syndrome have an extra Y chromosome, or XYY. XYY syndrome is not caused by anything the parents did or did not do. The disorder is a random error in cell division.
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Can XY ever be female?

Swyer syndrome affects sexual development. People with this intersex condition have XY (male) chromosomes and functional female genitalia. With Swyer syndrome, ovaries or testes never develop, so you won't go through puberty unless you have hormone replacement therapy.
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What is the genotype of YY?

Diploid organisms that are homozygous for a gene have two identical alleles, one on each of their homologous chromosomes. The genotype is often written as YY or yy, for which each letter represents one of the two alleles in the genotype. The dominant allele is capitalized and the recessive allele is lower case.
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Can a man not have xy chromosomes?

This means that in the United States there are about 7,500 men without a Y chromosome. The equivalent situation – females who have XY instead of XX chromosomes – can occur for a variety of reasons and overall is similar in frequency.
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Can intersex people have yy chromosomes?

This means a child may not have the typically male (XY) or female (XX) chromosomes and instead have a combination such as XXY or XYY. Some intersex people do fit into either the XX or XY category but develop female anatomy on the outside and male anatomy on the inside.
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Can a female carry a Y chromosome?

Yes, a woman can have a Y chromosome due to rare genetic conditions like Swyer Syndrome or Complete Androgen Insensitivity (CAIS), where individuals with an XY makeup develop as female because their bodies don't respond to male hormones (androgens) or lack the necessary male-determining genes, leading to female external features despite having male chromosomes. These individuals live as women, often discovering their chromosomal difference at puberty when menstruation doesn't occur. 
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Do XY females have breasts?

Due to the inability of the streak gonads to produce sex hormones (both estrogens and androgens), most of the secondary sex characteristics do not develop. This is especially true of estrogenic changes such as breast development, widening of the pelvis and hips, and menstrual periods.
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Can an XY get pregnant?

Yes, it's possible for a person with XY chromosomes to get pregnant, but it's extremely rare and requires specific, uncommon biological conditions, usually involving Swyer syndrome (XY gonadal dysgenesis), where they have a uterus and fallopian tubes but lack ovaries, allowing pregnancy with donated eggs via IVF. Most people with XY chromosomes don't have a uterus, making pregnancy impossible, but in these rare cases, hormone therapy helps develop the uterus, and assisted reproduction enables pregnancy and birth. 
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Can an XY male have a uterus?

Persistent Müllerian duct syndrome is a disorder of sexual development that affects males. Males with this disorder have normal male reproductive organs , though they also have a uterus and fallopian tubes, which are female reproductive organs .
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What was Jesus DNA made of?

ABSTRACT The DNA constituent of Jesus is typically the same DNA of his mother Mary with activation and/ or addition of extra genes that add unique characteristics and capabilities to the fetus, not present in the DNA of humans, such as the ability of the fetus to speak early while he is in the cradle, its ability to ...
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Where in the Bible does it say Jesus was unrecognizable?

The Bible describes Jesus as unrecognizable primarily in the Old Testament prophecy of Isaiah 52:14, which states His appearance was "marred more than any man, and His form more than the sons of men," and again in Isaiah 53:2, noting He had "no beauty or majesty to attract us to him, nothing in his appearance that we should desire him," highlighting His ordinary, suffering state before His crucifixion. These prophecies describe the Messiah's disfigured, non-descript look due to intense suffering, making Him seem less than human, especially after Roman scourging.
 
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Was Jesus straight or asexual?

Mainstream Christian thinking typically assumes Jesus to have remained celibate and without a defined sexuality, living a pious life free from sins such as lust or fornication.
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What gender am I if I have XY chromosomes?

Sperm, however, can either have an X or a Y chromosome. Therefore, if a sperm with an X chromosome fertilises an egg, the resulting zygote will be female (XX). On the other hand, if the sperm which fertilises the egg has a Y chromosome, the zygote will be male (XY).
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Is XXY or XYY worse?

Participants included males with XXY (N=102, M=10.08 years), XYY (N=40, M=9.93 years), and XXYY (N=32, M=11.57 years). XXY had lower (better) SRS scores compared to XYY and XXYY. Scores were not significantly different between XYY and XXYY.
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