Drosophila melanogastor has $8$ chromosomes in somatic cell. How many linkage groups will be there
$4$
$8$
$2$
$5$
Wilson detected the colour blindness disease in
A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children ($2$ daughters and $5$ sons). Three of the sons suffer from the given disease but none of the daughters are affected which of the following mode of inheritance do you suggest for this disease
Barr bodies are
The theory where ratio between the number of $X$-chromosomes and number of complete sets of autosomes will determine the sex is known as
Which of the following type of mutation involves the reverse order of genes in a chromosome?