The length of linker DNA varies between species. What is the length of linker DNA if a sample of genomic DNA were partially digested with micrococcal nuclease and the band visualized was 200bp

The length is going to be 200 base pairs.

Explanation:

The nuclease digestion from the micrococcal nuclease is capable of promoting endonuclease activity, which allows cutting only the linker DNA, thus if such digestion were performed then the band visualized presumably would be the linker DNA itself.

the genotypes would be 50% bb and 50% bb

the phenotypes would be 50% brown and 50% white. hope this : )