Asked by: Annelie Rendeiro
science genetics

What genes are on the Y chromosome?

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In mammals, the Y chromosome contains a gene, SRY, which triggers embryonic development as a male. The Y chromosomes of humans and other mammals also contain other genes needed for normal sperm production.


In this way, what are the genes on the Y chromosome responsible for?

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.

Similarly, what traits are passed on the Y chromosome? The Y chromosome is a puny bit of DNA that has only a few genes. And the genes it does have mostly deal with being male. So the only traits that are passed from father to son through the Y are those that turn an embryo into a male and those that make a man fertile once he reaches puberty.

Beside above, 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.

Where is the Y chromosome located?

STRUCTURE OF THE Y CHROMOSOME Genes in the two pseudoautosomal regions (PAR1 and PAR2) as well as those in the nonrecombining Y region (NRY) are illustrated. The Pseudoautosomal regions (PAR): PAR1 is located at the terminal region of the short arm (Yp), and the PAR2 at the tip of the long arm (Yq).

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Can you have YY chromosomes?

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What does Y chromosome not detected mean?

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How long does the Y chromosome last?

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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.

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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.

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At what point is gender determined?

A human fetus does not develop its external sexual organs until seven weeks after fertilization. The fetus appears to be sexually indifferent, looking neither like a male or a female. Over the next five weeks, the fetus begins producing hormones that cause its sex organs to grow into either male or female organs.

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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.

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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.

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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).

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What is the female chromosome?

The X chromosome is one of the two sex chromosomes in humans (the other is the Y chromosome). Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells.

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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.

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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).

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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.

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Who has stronger genes mother or father?

Paternal genes have been found to be more dominant than the maternal ones. Genes from your father are more dominant than those inherited from your mother, new research has shown.

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Can a father and son have the same DNA?

Each son receives DNA for his Y chromosome from his father. This DNA is not mixed with that of the mother, and it is identical to that of the father, unless a mutation occurs. It has been estimated that a mutation occurs about once every 500 generations, or every 15,000 years, give or take a few millennia.

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What traits are Y linked?

For a trait to be considered Y linkage, it must exhibit these characteristics:
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  • appears in all sons of males who exhibit that trait.
  • is absent from daughters of trait carriers; instead the daughters that are phenotypically normal and do not have affected offspring.

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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.

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What is Y linked dominant?

Y-linked inheritance. Pedigree analysis of a Y-linked trait. Y-linked traits never occur in females, and occur in all male descendants of an affected male. The concepts of dominant and recessive do not apply to Y-linked traits, as only one allele (on the Y) is ever present in any one (male) individual.