Despite a great deal of variation across the animal kingdom, Hox genes tend to appear along a chromosome or chromosomes in the same order that they are expressed in along the anteroposterior axis of an embryo
This pattern of Hox gene expression is called the ________. [four words] Fill in the blank(s) with correct word
canonical spatial expression pattern
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Which of the following is a TRUE statement
concerning ecosystems?
a. Energy flow through an ecosystem is one way and nutrients are recycled. b. Energy and nutrients are both recycled. c. Energy flow and nutrient flow are both one way. d. Nutrient flow through an ecosystem is one way and energy is recycled. e. None of these statements is true.
Which of the following combinations of chromosomes would be typical of a human male?
A. two X-chromosomes B. an X-and a Y-chromosome C. 2 Y-chromosomes D. None of these is correct.
________ appear on root cells near root tips to help take up water and nutrients from the soil.
Fill in the blank(s) with the appropriate word(s).
Which genus is the most common resident flora of mouth surfaces?
A. Mycobacterium B. Streptococcus C. Haemophilus D. Escherichia E. Lactobacillus