Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Crosses among heterozygotes give a 12:3:1 ratio
What type of gene interaction would account for these results?
epistasis
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If a tunicate's pharyngeal gill slits were suddenly blocked, the animal would have trouble _____
A) respiring B) feeding C) moving D) respiring and feeding E) feeding and moving
Consider the data in Fig. 46.8 illustrating the age structure of France and India. In many parts of the world, the average age of reproductive maturity is increasing as humans move from urban to rural environments
Suppose that the current average age of first reproduction is 15 years in India and 20 years in France. How would a 5-year increase in the average age of reproductive maturity in both countries be expected to affect the per capita birth rate, and would this effect be greater in France or in India? A. increase in per capita birth rate, greater effect in India B. increase in per capita birth rate, greater effect in France C. decrease in per capita birth rate, greater effect in India D. decrease in per capita birth rate, greater effect in France
Osmosis is best defined as the movement of
What will be an ideal response?
Reverse transcriptase, the enzyme responsible for copying viral RNA into cDNA prior to integration into the host genome, lacks 3'-to-5' exonuclease "proofreading" ability. How is this advantageous to organisms that depend on such enzymes?
What will be an ideal response?