Describe the structure of a DNA microarray and its use
What will be an ideal response?
A DNA microarray is a glass plate divided into fields containing a specific DNA probe of about 20 nucleotides. The sequence of the probe differs by one nucleotide from field to field. A chip can hold more than 500,000 fields. DNA is extracted from cells and cut with one or more restriction enzymes. The fragments are fluorescence tagged, denatured, and annealed to the DNA in the array. Massive amounts of DNA can be screened for sequence changes in a relatively short period of time.
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Microarray analysis is used to
A. determine the size of gene fragments after digesting with restriction endonucleases. B. analyze an organism's entire genome. C. determine which genes are being expressed in an organism. D. analyze an individual's single nucleotide polymorphisms.
An evolutionary advantage of the endoskeleton is that it (choose all correct answer options):
A. allows growth of fairly large organisms. B. protects vital internal organs. C. provides a structure on which muscles can pull for an organism to move. D. makes the process of reproduction more efficient.
After a baby is delivered, what else is expelled from the female's uterus?
a. placenta b. uterine lining c. primary oocytes d. oxytocin e. corpus luteum
Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
A) 2:1 B) 1:1 C) 1:2:1 D) 3:1