Which of the following is the best
representation of a testcross?
a. AA x aa
b. Aa x aa
c. AA x A?
d. A? x aa
e. AA x a?
D
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A hollow neural tube will develop into all of the following EXCEPT
a. fluid-filled ventricles. b. the forebrain, midbrain, and hindbrain. c. the central canal of the spinal cord. d. spinal nerves. e. the spinal cord.
If a gardener wanted to help prevent erosion along a slope, it would be best to plant because they have _.
A. grasses; fibrous roots B. trees; fibrous roots C. grasses; taproots D. trees; taproots
Of the visible light spectrum, blue wavelengths penetrate the deepest into water
Indicate whether the statement is true or false
The influenza virus contains an RNA genome. Why do scientists typically have to make a new vaccine for the flu every year?
Because our bodies develop resistance to the vaccine and it becomes less effective Because the virus develops resistance to the vaccine Because the virus can mutate into new strains Because people change their habits each year and become susceptible to different strains of the virus Because the common influenza virus can come from many species of animals including cats and dogs