A male can transmit a Pseudoautosomal gene to
A neither his sons nor his daughters
B both his sons and his daughters
C his sons, but not to his daughters
D his daughters, but not to his sons
The correct answer and explanation is:
The correct answer is B: both his sons and his daughters.
Pseudoautosomal genes are located on the X and Y chromosomes in regions that are homologous between the two. These regions, called pseudoautosomal regions (PARs), are involved in pairing and recombination during meiosis. They allow for the X and Y chromosomes to align properly during the formation of gametes.
In males, who have one X and one Y chromosome, the pseudoautosomal genes are located on both chromosomes. When a male transmits his genetic material to offspring, he passes either the X or Y chromosome.
For daughters, a male will contribute his X chromosome, which carries the pseudoautosomal genes. Thus, he can pass on these genes to his daughters.
For sons, a male will contribute his Y chromosome, which also carries pseudoautosomal genes. Hence, he can transmit these genes to his sons as well.
Because of the inheritance pattern of pseudoautosomal genes, males can pass them to both their sons (via the Y chromosome) and daughters (via the X chromosome). This distinguishes pseudoautosomal inheritance from genes located in other regions of the X or Y chromosomes, where inheritance patterns differ between male and female offspring. For example, a gene located solely on the X chromosome will only be passed to daughters from fathers and only to sons from mothers, while a gene on the Y chromosome will only be passed to sons.