6) You isolate a lambda phage that overproduces uncleavable cI. Is this mutation likely to be dominant or recessive?
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10) An Hfr strain lacZ- lacY+ pro+ Strs is crossed against an F- lacZ+ lacY- pro- StrR strain. After about two hours, the mixture was plated onto media containing streptomycin but no proline. Afterwards, the pro+ StrR recombinants were tested for their ability to grow on lactose as the sole carbon source. pro+ lac+ colonies were extremely rare and the majority of the colonies were pro+ lac-. What is the most likely order of lacZ and lacY relative to pro? (hint: a second cross Hfr+ lacZ+ lacY- pro+ StrS X F- lacZ- lacY+ pro- StrR has many lac+ pro+ colonies).
a.lacY pro lacZ
b.pro lacY lacZ
c.lacY lacZ pro
d.lacZ lacY pro