Mark the correct statement (w.r.t. sickle cell-anaemia)
Homozygous individuals for $Hb^{S}$ are apparently unaffected
Heterozygous individuals exhibit sickle-cell trait
Heterozygous individuals are affected as well as carrier
Homozygous individuals for $Hb^{A}$ show the diseased phenotype
A recessive gene is one which
In man, albinism is due to non-synthesis of melanin in the absence of
A female with $XXXX$ chromosome will have the following number of Barr bodies
A diseased man marries a normal woman and they get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is
Which of the following type of mutation involves the reverse order of genes in a chromosome?