Crosses between two dihybrid F1 pea plants, which are offspring from a parental cross AABB x aabb, result in F2 phenotypic ratios close to __________.
A) 1:2:1
B) 3:1
C) 1:1:1:1
D) 9:3:3:1
Answer: D) 9:3:3:1
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Signal transduction is the process by which:
A. transcription factors bind to cis-regulatory regions of DNA and either activate or repress transcription. B. a specific combination of transcription factors determines the developmental pathway in a cell or group of cells. C. a single master gene, or signal, activates a series of downstream genes that lead to cell differentiation. D. an extracellular molecule activates a membrane protein, which in turn activates molecules inside the cell. E. None of these choices is correct.
A falsifiable hypothesis cannot be tested
__________________ Indicate whether the statement is true or false.
What is not a common ecosystem service of estuaries, mangroves, AND salt marshes?
The filtration step in the formation of urine for animals sorts materials only by
A. whether they are charged or not. B. overall size with cells and proteins usually being kept out of the filtrate. C. whether the substance in question is a waste product or not. D. whether they contain nitrogen or not. E. the hydration state of the body.