The most common autosomal trisomy is
a. Turners syndrome.
b. XXY (Klinefelter syndrome).
c. Fragile X syndrome.
d. trisomy 21 (Down syndrome).
Answer: d. trisomy 21 (Down syndrome).
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How can you determine the genotype of a plant showing the dominant phenotype of red color?
A. The phenotype reflects the genotype, so the plant must be homozygous for the trait. B. Cross the red plant with a white plant to see if any white plants appear. C. Cross the red plant with other red plants to see if any white plants appear. D. Cross the red plant with a white plant to see how many red plants appear. E. Cross the red plant with another red plant, and then cross the F1 population with each other to see if any white plants appear.
Which of the following is NOT found in a
femur?
a. spongy bone b. compact bone c. connective tissue d. collagen e. all of these are found in a femur
The nerves are the organs of the _________ nervous system.
Fill in the blank(s) with the appropriate word(s)
Which of the following evidence most strongly supports the common origin of all life on Earth? All organisms _____
A) require energy B) use essentially the same genetic code C) reproduce D) show heritable variation E) evolve