Set up a mating between an Hfr strain and an F- (ade- his- bio-) strain and detect bio+ recombinant. Which of the following mating can let me select the recombinant by a single step (or a single selective medium)? 1. Hfr (ade + his+ bio+ Str-S) X F- (ade- his- bio-)
2. Hfr (ade+ his- bio-) X F- (ade- his- bio-)
3. Hfr (ade+ his+ bio+ Str-R) X F- (ade- his- bio- Str-S)
4. Hfr (ade+ his+ bio+ Str-S) X F- (ade- his- bio- Str-R)

human-caused climate hope this

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

d. changes in climate and historical records

hope this

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.