The anterior-posterior direction of a mammal is initially controlled by
a. maternal effect genes
b. gap genes
c. pair rule genes
d. segment polarity genes
e. homeotic genes
A
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The zenk gene in the zebra finch brain is activated by tactile stimuli
a. True b. False
Which graph shows that species diversity is
much less at the equator than at 60 degrees north latitude? a. A b. B c. both d. neither e. not enough data is provided to answer the question
Which statement is False?
What will be an ideal response?
Which of the following statements are true of xylem?
A. It contains specialized cells known as tracheids. B. It is found in the gametophyte generation, but not in the sporophyte. C. It provides structural support to the plant. D. It is found in all land plants. E. It assists in conducting materials, such as water and minerals, throughout the plant.