Asked by: Peligros Hakhanyan
science genetics

How does the Y chromosome determine maleness in humans?

Last Updated: 19th February, 2020

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Y is normally the sex-determining chromosome in many species, since it is the presence or absence of Y that typically determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers male development.

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Also question is, how does the Y chromosome determine maleness in a human embryo?

Because only males have the Y chromosome, the genes on this chromosome tend to be involved in male sex determination and development. Sex is determined by the SRY gene, which is responsible for the development of a fetus into a male. As a result, men and women each have two functional copies of these genes.

Also Know, what percentage of human sperm cells carry an Y chromosome? Answer and Explanation: The percentage of human sperm cells that carry an X chromosome is 50%. Statistically speaking, since male zygotes have both an X and a Y chromosome,

Similarly one may ask, what is the gender of YY?

Instead of having one X and one Y sex chromosome, those with XYY syndrome have one X and two Y chromosomes. Sex chromosome abnormalities like XYY syndrome are some of the most common chromosome abnormalities. XYY syndrome (also called Jacob's syndrome, XYY karyotype, or YY syndrome) affects only males.

What does Y chromosome not detected mean?

NEGATIVE for the presence of Y-chromosome. This means that 1) the mother is carrying a female fetus, or 2) the amount of fetal DNA in the maternal blood sample was too low to detect the presence of Y-chromosome.

Related Question Answers

Radostin Dahlen

Professional

What does Y chromosome code for?

Y is normally the sex-determining chromosome in many species, since it is the presence or absence of Y that typically determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which by default triggers male development.

Adolfo Amella

Professional

How long does the Y chromosome last?

For a boy, sperm with the Y chromosome should be deposited as close as possible to the egg because the Y chromosome has a short lifespan and it will not live longer than 24 hours, compared with the sperm with the Y chromosome which will live in a woman's body for up to 72 hours.

Xiaowei Usyskin

Professional

What is XYY syndrome?

XYY syndrome is a genetic condition in which a male has an extra Y chromosome. Symptoms are usually few. They may include being taller than average, acne, and an increased risk of learning problems. There are 47 chromosomes, instead of the usual 46, giving a 47,XYY karyotype.

Guglielmo Haluga

Explainer

Can you have YY chromosomes?

Most people have 46 chromosomes in each cell. In males, this typically includes one X chromosome and one Y chromosome (XY). Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob's syndrome, XYY karyotype, or YY syndrome.

Johnson Heuschild

Explainer

Are Y chromosome sperm swim faster?

Alongside thinking about the pH status of the reproductive tract, Shettles' idea was that Y sperm (leading to male babies) swim faster than X sperm (leading to female babies), therefore if sex is timed close to ovulation they will arrive at the egg first. However, Y sperm live fast and die young.

Sotirios Turoverov

Explainer

Why does the Y chromosome not cross over?

Typically, genes from the mother and father are shuffled -- or, "cross over" -- to produce a genetic combination unique to each offspring. But the Y chromosome does not undergo crossing over, and, as a result, its genes tend to degenerate, while repetitive DNA sequences accumulate. Each chromosome is made up of DNA.

Jinguo Hiendl

Pundit

Are there any Y linked diseases?

The Y chromosome is the other half of the XY gene pair in the male. However, the Y chromosome doesn't contain most of the genes of the X chromosome. Because of that, it doesn't protect the male. Diseases such as hemophilia and Duchenne muscular dystrophy occur from a recessive gene on the X chromosome.

Natascia Garcia

Pundit

Why is the Y chromosome so small?

The study shows that essential Y genes are rescued by relocating to other chromosomes, and it identifies a potentially important genetic factor in male infertility. The Y chromosome is dramatically smaller than the X chromosome and has already lost nearly all of the 640 genes it once shared with the X chromosome.

Nicasio Monsalve

Pundit

Is YY a girl?

Females typically have two of the same kind of sex chromosome (XX), and are called the homogametic sex. Males typically have two different kinds of sex chromosomes (XY), and are called the heterogametic sex.

Michelina Setien

Pundit

How many sexes are there in nature?

Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).

Puerto Kalistratov

Pundit

Does temperature of sperm affect gender?

The control temperature of 37°C had no influence on sex-chromosome ratios, but when the temperature was elevated to 41°C, there was a considerable increase in the incidence of X-chromosome-bearing spermatozoa in the sample.

Avis De Gomar

Teacher

Is Klinefelter syndrome an intersex condition?

Klinefelter syndrome occurs as a result of a random error that causes a male to be born with an extra sex chromosome. It isn't an inherited condition. Humans have 46 chromosomes, including two sex chromosomes that determine a person's sex. Females have two X sex chromosomes (XX).

Peio Kata

Teacher

What chromosomes do hermaphrodites have?

Hermaphroditism. If abnormalities of cell division occur, a fetus with mosaicism may result. The baby may have both cells with 46 XY chromosomes and cells with 46 XX chromosomes. This condition has been called hermaphroditism (after the greek god Hermes and goddes Aphrodite) and it is one of many causes of intersex.

Iulian Jacopo

Teacher

How can I increase Y sperm cells?

Here are 10 science-backed ways to boost sperm count and increase fertility in men.
  1. Take D-Aspartic Acid Supplements.
  2. Exercise Regularly.
  3. Get Enough Vitamin C.
  4. Relax and Minimize Stress.
  5. Get Enough Vitamin D.
  6. Try Tribulus Terrestris.
  7. Take Fenugreek Supplements.
  8. Get Enough Zinc.

Frances Cabo

Teacher

What gender is an XXY chromosome?

Usually, females have two X chromosomes (XX). Males have an X and a Y (XY). But in rare cases, a male is born with an extra X chromosome (XXY). This is Klinefelter syndrome.

Valdemar Risquete

Reviewer

What should we eat to increase Y chromosome?

You can up your intake by eating:
  • green, leafy vegetables, such as spinach, romaine lettuce, Brussels sprouts, and asparagus.
  • fruits and fruit juices, especially oranges and orange juice.
  • nuts, beans, and peas.
  • whole grains.
  • fortified breakfast cereals.
  • enriched flour products, such as breads and pasta.

Piedras Casqueira

Reviewer

Can you test sperm for Y chromosome?

Because men have one "X" and one "Y" chromosome, half of their sperm will carry the "X" chromosome and half will carry the "Y" chromosome. It can therefore be soon that men are responsible for sex determination.

Terina Ionel

Reviewer

Does sperm contain Y chromosome?

The father's sperm contains about half X and half Y chromosomes. The sperm are the variable factor in determining the sex of the baby. If the sperm carries an X chromosome, it will combine with the egg's X chromosome to form a female zygote. If the sperm carries a Y chromosome, it will result in a male.

Ginel Nebrera

Reviewer

Where does the Y chromosome come from?

The X and Y chromosomes, also known as the sex chromosomes, determine the biological sex of an individual: females inherit an X chromosome from the father for a XX genotype, while males inherit a Y chromosome from the father for a XY genotype (mothers only pass on X chromosomes).