Aniridia is a human condition in which the eye has no iris. The protein encoded by the gene responsible for aniridia is very nearly identical to the protein product of the fly Eyeless protein
What experiment could provide evidence that the two genes are functionally equivalent? A) Introduce the aniridia mutation into Drosophila embryos to look for iris formation.
B) Sequence the Eyeless and aniridia DNA sequences and regulators.
C) Use the Eyeless mRNA as a probe in other invertebrate and non-mammalian species.
D) Introduce the mouse aniridia wild-type sequence into the fly egg to see whether mouse eyes develop.
E) Introduce the mouse aniridia wild-type sequence into the fly egg to see whether fly eyes develop.
E
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Twin spotting provides evidence of what genetic event?
A) meiotic recombination B) mitotic recombination C) linkage D) mutation E) biological evolution
Type 1 fucosidosis is a rare human disease. Patients cannot hydrolyze the disaccharide fucose, and as a result have severe neurological decline and die by age 6. The disease is due to a defect in the gene that encodes the lysosomal enzyme that breaks down fucose (?-1-fucosidase), and is inherited in an autosomal recessive manner. Jane and John have a child who has Type 1 fucosidosis. What is the probability that their next child will also have the disease?
A. 1/2 B. 4/4 or 100% C. 1/4 D. No chance E. 3/4
A microbiologist is testing the drinking water for a municipality. What would be the best method for testing the purified water?
A. Measurement of microbial mass B. Direct microscopic count C. Membrane filtration D. Viable plate count
A coelom is a fluid-filled or air-filled space located __________.
a. within the digestive tract b. within the internal organs, such as the vertebrate kidneys c. between the outer surface of the body and the musculature d. between the digestive tract and outer body wall e. anywhere within the body