When heterozygous tall plants are self-pollinated than tall and dwarf plants are obtained, this is explain to

$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?

Edward's syndrome, Patau's syndrome and Down's syndrome are due to

$A$ : The heterozygotic female for haemophilia may transmit the disease to sons.
$R$ : Such traits show criss-cross inheritance