All the sons are haemophilic and daughter are normal of a haemophilic father and normal mother. This character is
$X$-linked recessive
$Y$-linked recessive
$X$-linked dominant
$Y$-linked dominant
In which of the sex determination both male and female have same number of chromosomes?
Number of Barr bodies in $XXXXY$ is
What is the unit of crossing over
Chiasmata firstly seen in
How many nucleosomes are found in helical coil of $30\ nm$ chromatin fibre