In humans,sex-linked traits are primarily transmitted by:

Which of the following characteristics is shown by a gene located on the $X$-chromosome in males?

The grasshopper is an example of which type of sex determination?

The sex of a human child is determined by:

The formation of a male child depends on the sperms because

Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on