Sex chromosomes of a female bird are represented by
$XO$
$XX$
$XY$
$ZW$
Dominant epistasis is shown by
The salivary gland chromosomes in the dipteran larvae are useful in gene mapping because
A distinct mechanism that usually involves a short segment of $DNA$ with remarkable capacity to move from one location in a chromosome to another is called
A person with blood group$-A$ has
In Barr body (sex-chromatin) of a normal female