What do scientists use to guide their behavior and actions while they perform their work

The correct answer is Ethics

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.