The traits controlled by the genes located on $X$ chromosome of human beings are said to be
Sex linked
Sex influenced
Sex limited
None of these
The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because
Linked gene are separated by
Polydactyly in man is due to
Which of the following type of mutation involves the reverse order of genes in a chromosome?
Dominant lethal gene is one which