___$(B)$___ used the frequency of recombination between gene pairs on the ___$(A)$___ as a measure of the distance between genes and mapped their position on the chromosome

$(A) \;\;\quad\;\;(B)$

In which of the following disorder a single protein that is a part of the cascade of proteins involved in blood clotting is affected?

$9 : 3 : 3 : 1$ ratio is modified to $9 : 7$ ratio due to

When a segment of a chromosome breaks and later rejoins after $180^{\circ}$ rotation,it is known as

Animal which remains male initially, then changes to female $(Tapeworm\, proglottides)$ is called