Which plant was used by Taylor to prove semiconservative replication at chromosomal level?

The structure present over chromosome is

The function of chromosomes of carrying the genetic information from one cell generation to another is performed by

A male human is heterozygous for autosomal genes $A$ and $B$ and is also hemizygous for hemophilic gene $h$. What proportion of his sperms will be $abh$

Plasmids so found in bacteria are

The grouping of human chromosomes is based on