Give 3 reasons why plasmids are considered ideal vectors.

Self-replicating: Plasmids contains origin of replication and hence they are able to multiply by themselves independently of the chromosomal DNA. They maintain their number in progenies.

ii) Low molecular weight: Plasmids have low molecular weight which makes them easy to handle and hence can be present in multiple copies.

iii) Multiple Cloning Sites: This is a site on plasmid which has recognition sites for many restriction enzymes.

iv) Selectable Marker:  Plasmid has certain genes which help in identifying the transformed cells. For example, antibiotic resistance genes.

v) High copy number: Due to low molecular weight of plasmids, they are present in multiple copies. High copy number plasmids are require to produce large quantities of the recombinant DNA.

vi) Host range: Plasmids used as coning vectors have narrow host range so that transmission of these plasmids to other organism in environment is avoided.

Explanation:

we would need to see the picture to answer it

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.