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Leokris [45]
4 years ago
15

PLEASE HELP! 50 POINTS!

Biology
1 answer:
klemol [59]4 years ago
7 0

2. Darwin also named some factors that affect the process of natural selection. Among these were overproduction, competition, and variations. Overproduction happens when species reproduce many more offspring than can possibly survive. ... Those who are better able to survive then pass on their genes to their offspring.


3. Evolutionary change can occur through mutation and natural selection. Mutations are genetic changes in an organism. ... Even though outside factors can cause mutation to occur, what kind of genetic change will occur is random. Mutations can be harmful, beneficial, or neutral.



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In Escherichia coli, the genes lac , gal , trp , and his are necessary for utilization of lactose, utilization of galactose, syn
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Answer:

Minimal media + glucose + streptomycin

Explanation:

Those capable of synthesizing galactose can grow in minimal media, the availability of streptomycin will destroy those who are susceptible to the antibiotic, whereas glucose, a carbon source from which galactose may be produced and will encourage growth.

Therefore:

The medium should not include galactose when selecting for gal⁺.

Streptomycin should be present in the medium to select against str^s.

The medium to choose is: Minimal media + glucose + streptomycin.

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