What would you like to do?
What do the genetic codes xx and xy mean?
xx and xy are the chromosomes of the male and female body. the female has xx chromosome and the male has xy chromosomes the sex determination chromosomes
+ 22 others found this useful
Was this answer useful?
Thanks for the feedback!
XX are the female chromosomes and XY are the male chromosomes.
There are 22 autosomal chromosomes and 2 sex chromosomes in humans. In all the other chromosomes, the homologous pairs match up genetic loci. However, in human sex chrom…osomes the X and Y chromosome are different (with the X chromosome being much larger and the Y chromosome carrying genes that cause "maleness"). Someone with an X and a Y chromosome is a male because he has a Y chromosome that carries the genes that code for "maleness". Females "lack" this Y chromosome, and thus show characteristic female phenotypes.
An xx and an xy cell are used to denote female and male zygotic cells, respectively. They are formed from the union of a female x egg and a male x or y sperm.
First of all, you're mistaken if you asked yourself this question: XX is the female sex chromosome combination, and XY is male. It's important to realise that this… is the case in humans, but not in all animals. Other animals, for example insects, have different mechanisms for sex determination. In humans, a fertilised egg cell will divide a few times. Then each cell will turn off all but one of its X chromosomes (the phrasing is because in rare cases a fertilized egg can end up with three or more X chromosomes). This is possible and necessary because one X is sufficient to produce the proteins encoded on it, hence two active X would result in twice the amounts needed. If you now wondered whether an embryo can also survive and grow to adulthood with only one X and no other sex chromosomes, you are correct. This is called monosomy X and causes a condition known as Turner syndrome. Any human with only X chromosomes will be female. The Y chromosome, which is much smaller than the X chromosome, carries some additional genes whose influence will set off several mechanisms which ultimately lead to the development as a male instead. A Y chromosome alone cannot sustain life as it does not contain many of the vital genes which are located on the X chromosome.
XX are the sex defining chromosomes for a girl and XY for boys
female eggs r all same having 22+x as genetic material..but male sperm is of 2 types 22+x &22+y...if 22+x crosses with egg,it result in44+xx which is a female...but if 22+y cr…osses with egg,it result in 44+xy i.e.male
this means that the same genetic code that is used in humans is used in all other types of organisms as well. anything from animals to plants to bacteria uses the same system …of triplet nucleotide bases (codons) to code for a single amino acid when building a polypeptide. remember that the genetic code is also degenerate- each codon only codes for one amino acid, but there can be several different codons that call for the same amino acid.
Answer xx is girl xy is boy
Men are XY.
20. x in roman numerals is 10 so xx is 20
It means that some amino acids can be specified by more than one codon. Another term for this is the genetic code is degenerate.
It is referring to the male chromosome whereas the the female gender chromosome is XX.
Females have two X chromosomes, and males have one X and one Y. Why are they called "X" or "Y"? A somewhat practical reason, actually- that is their shape.
it means that they checked the knife and everything about it twice. So it should never have any mistakes. It turned into the logo for case knives today.
Yes, but more specifically it's the presence of a Y chromosome that determines whether a person is male. The Y chromosome carries a gene called SRY which is the blueprint …for a protein called testes determining factor (TDF). If a person has a Y chromosome, they make the TDF protein. TDF turns on other genes that trigger the development of male sex characteristics. Human fetuses have the rudiments of both male and female reproductive systems until about six weeks of life. At that point, if the fetus has a Y chromosome with the SRY gene, it will make the TDF protein. TDF acts as master control switch, turning on development of the male reproductive system. In these fetuses, the female system breaks down. If a the fetus doesn't have a Y chromosome or SRY gene, the male system breaks down and the female system develops. Scientists learned a lot about the role of the sex chromosomes by studying people don't have the typical number. People who have a Y chromosome with two or more X chromosomes (like XXY for example) have Klinefelter Syndrome. These people have the Y chromosome and the SRY gene, so they develop a male reproductive system and male characteristics, but they do have some atypical characteristics due to the presence of the extra X(s). People who only have one X chromosome and no other sex chromosome have Turner Syndrome. These people are female because they lack a Y chromosome, but they also have some developmental differences from XX females. From these patterns, you can see that it's the presence or absence of the Y chromosome that determine male vs. female. The story became even more interesting when scientists discovered people who were XX but appeared male, and people who were XY but appeared female. That's when scientists realized it wasn't just about having a Y chromosome, it was about having a particular piece of the Y chromosome: the piece that included the SRY gene. The man who was chromosomally XX had an extra bit of DNA attached to one of his X chromosomes; a bit of a Y chromosome that contained the SRY gene. And the women who were chromosomally XY? Their Y chromosomes were missing the SRY gene.