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For the development of male offspring.
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∙ 13y ago
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What is on the Y chromosome that may provide instructions for sperm production?
The much smaller Y chromosome has only about 26 genes and gene families. Most of the Y chromosome genes are involved with essential cell house-keeping activities (16 genes) and sperm production (9 gene families). Only one of the Y chromosome genes, the SRY gene, is responsible for male anatomical traits.When any of the 9 genes involved in sperm production are missing or defective the result is usually very low sperm counts and subsequent infertility. About 1/3 of couples is unable to have children as a consequence of the male mate not having the necessary sperm producing genes on his Y chromosome. The Y chromosome has few active genes and mostly contains genetic junk rather than genes.
Why does the y chromosome not carry any alleles?
The Y chromosome is smaller than the X chromosome and contains fewer genes. It carries the genes necessary for determining male sex and some other genes, but it lacks many of the genes present on the X chromosome. This is why the Y chromosome does not carry any alleles in the same way that the X chromosome does.
Can you live with a y-chromosome and no x-chromosome?
No. The human X chromosome contains over 1000 genes, many of which are essential for life. The Y chromosome in comparison has only about 120 genes. A zygote with Y0 or YY (one or two Y chromosomes) would not be viable.
How many times bigger is the x chromosome from the y chromosome?
In terms of base pairs, the X chromosome is about 155 megabases (million bases), and the Y is about 57 megabases. Note that there can be variation in the lengths of Y chromosomes between men, due to different amounts of constitutive heterochromatin on the long arm. That is, the long arm of the Y contains repeated sequences. The number of these sequences can be different between individuals, thus the size of the chromosome can be different between men.
Where are the genes that determine gender found?
The genes that determines gender can be found in the Y chromosome.
What is on the Y chromosome that may provide instructions for sperm production?
The much smaller Y chromosome has only about 26 genes and gene families. Most of the Y chromosome genes are involved with essential cell house-keeping activities (16 genes) and sperm production (9 gene families). Only one of the Y chromosome genes, the SRY gene, is responsible for male anatomical traits.When any of the 9 genes involved in sperm production are missing or defective the result is usually very low sperm counts and subsequent infertility. About 1/3 of couples is unable to have children as a consequence of the male mate not having the necessary sperm producing genes on his Y chromosome. The Y chromosome has few active genes and mostly contains genetic junk rather than genes.
The Y chromosome is larger and carries fewer genes than the X chromosome?
No. The Y chromosome is much smaller than the X chromosome. There are only about 70 active genes on the Y chromosome and many more deleteriously mutated one. The X chromosome contains many more active genes and only crosses over marginally with the Y chromosome.
Which chromosomes carries the fewest numbers of genes?
The y chromosome, which only contains a few hundred genes.
Why does the y chromosome not carry any alleles?
The Y chromosome is smaller than the X chromosome and contains fewer genes. It carries the genes necessary for determining male sex and some other genes, but it lacks many of the genes present on the X chromosome. This is why the Y chromosome does not carry any alleles in the same way that the X chromosome does.
Does the y chromosome contain genes?
Yes.
Genes that are carried on the X or the Y chromosome?
Sex-Linked genes.
Can you live with a y-chromosome and no x-chromosome?
No. The human X chromosome contains over 1000 genes, many of which are essential for life. The Y chromosome in comparison has only about 120 genes. A zygote with Y0 or YY (one or two Y chromosomes) would not be viable.
How many times bigger is the x chromosome from the y chromosome?
In terms of base pairs, the X chromosome is about 155 megabases (million bases), and the Y is about 57 megabases. Note that there can be variation in the lengths of Y chromosomes between men, due to different amounts of constitutive heterochromatin on the long arm. That is, the long arm of the Y contains repeated sequences. The number of these sequences can be different between individuals, thus the size of the chromosome can be different between men.
A gene located on the X or Y chromosome is a?
Genes located on the X or Y chromosome are referred to as sex-linked genes. This is because the inheritance of these genes is dependent upon the sex of the individual. For example, only males can inherit genes located on the Y chromosome (because males have XY and females have XX).
Where are the genes that determine gender found?
The genes that determines gender can be found in the Y chromosome.
What chromosome contains sex-linked genes?
X and Y
What is a sex-linked genes?
It is a gene located on either sex chromosome (X or Y chromosome).
