E Actually it results in all of these Which of the following

E. Actually, it results in all of these.

Which of the following statements is true about genes that are present in the pseudoautosomal region?

Solution

B. males and females producing different amount protein is false.

X chromosome inactivation is random in the early embryos. The descendents of each cell will have the same X inactivated as their parent cell. This random inactivation gives unpredictable pattern of expression for some X-linked genes; this is if the gene is heterozygous. If the gene is homozygous it wouldnt matter which X chromosome is inactivated because both will lead to the same genetic expression. Inactivation involves in silencing by heterochromatization of one of the X chromosome which is known as Barr bodies. Now, the males have XY and the females somatic tissue has XX-one of which is inactivated. This equalizes the amount of protein produced from the X-linked genes. This phenomenon is dosage compensation.

For pseudoautosomal regions (a) traits encoded by gene in PAR can be inherited from either parents. These are the regions on the X and Y chromosomes that share identity and undergo recombination, therefore, the genes in the Y PAR can be passed on to both son and daughter. The same is true for genes in the X-PAR. Therefore, these genes behave like the autosomal genes.