What is a sex linked trait? which parent determines the trait for a male?

can u also explain why sex linked traits are more common in males?

What is a sex linked trait? which parent determines the trait for a male?
Sex-linked traits are all the traits that are determined by the genes carried by the sex-chromosomes. You might be knowing that females have two X chromosomes (so their genotype is XX) and males have one X and one Y (so their genotype is XY).





Now, Y is the smallest chromosome so it doesn't have many genes on it. So mostly, sex-linked disorders (i.e., some defect in a gene contained on a sex-chromosome) are because of X chromosome.





What happens is, when some gene on one of the X chromosomes is screwed up, females have the other X chromosome to compensate for it because the other X chromosome is the exact copy of the first, excepting that it doesn't have the defective gene. But males do not have that privilege. So, they suffer from most of the sex-linked disorders.





As for your second question, it is obvious that dad determines whether the baby is a male or for that matter, female too. Because mom only produces one type of gamete (ovum), i.e., which has X chromosome because she doesn't have a Y chromosome (gametes are haploid, so unlike somatic cells, they will have only one set of chromosomes. So, they will contain either X or Y chromosome). However, dad produces two types of sperms, some containing X chromosome and others containing Y chromosome. The gender of the baby will depend on which sperm fertilizes the ovum. If X sperm fertilizes the ovum, it will be a girl and if Y sperm fertilizes the ovum, it will a boy.





Hope I was helpful.
Reply:A sex linked trait is a genetic expression of an allele related to the gender of the individual and is directly tied to the sex chromosomes (X and Y).





The determining traits as far as gender itself belongs to Y(the male chromosome) due to the SRY gene. But the majority of allele expressions are from mom's X chromosome( color blindness, muscular dystrophy, and hemophilia, to name a few.).





The reason that sex linked traits are more common in males is due to the fact that they only have one functional X chromosome (from mom). Females inherit 2 X chromosomes, so that if they happen to inherit a faulty gene, they have a healthy gene backup in the other chromosome (unless it too has the flawed gene). Females with a healthy backup will show no signs of the gene, but will be carriers and can pass it on to their offspring. Males on the other hand will have to suffer the effects, since the Y chromosome cannot compensate for the genetic difference.
Reply:Sex linked traits are usually on the X chromosome, so males, only having one, are twice as likely to be passed sex linked traits.





PS You have to make the page, I don't. Google this, as there is much on line here.
Reply:Sex-linkage means that some genes for non-sexual characteristics are linked to genes for sexual characteristics by being on the same chromosome. In humans chromosome pair 23 is known as the sex pair because they contain all the information for sexual characteristics. They are symbolised as X and Y. Men have XY and females have XX.





The X-chromosome is much larger than the Y chromosome, and if there is a deficiency it is almost always in the X chromosome. As females have two X chromosomes they have a second normal gene to fall back on if one is deficient. Men cannot do this and if there is a deficiency they have to just deal with it. E.g. Haemophilia is sex-linked. The gene controlling the synthesis of a factor which contributes to blood clotting is found on the X chromosome.





Females are usually carriers of the defective gene. It is very rare for two defective genes to be present in the females. Female carriers have a 50% chance of passing the defective gene onto their offspring.