In Drosophila (fruit fly), red eyes is the wild type trait and purple eyes is a mutant version. Normal wings are wild type while curly wings is a mutant version. Which of the following genotype is correct for a homozygous red eyed, curly winged fly?
a) p+/p+ c/c
b) p/p c/c
c) p+/p+ c+/c
d) p+/p c/c
Answer: a) p+/p+ c/c
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In cows, certain coat colors are co-dominant
For example red is dominant; white is recessive; roan (red and white) is co-dominant. If a roan bull is crossed with a white cow what will be the expected coat colors of the calves?
a. all roan b. half roan and half white c. half red and half white d. 3/4 roan and 1/4 white e. 1/2 roan, 1/4 red, 1/4 white
The distribution of mitochondria between the daughter cells during cytokinesis
a. is random. b. is directed by the mitotic spindle. c. is directed by the centrioles. d. results in the mitochondria remaining in the parent cell. e. occurs only during meiosis.
Cold is preferred for storing food because it retards microbial growth by slowing down metabolic processes
Indicate whether the statement is true or false
HIV strains may differ by 10% within one person and by 35% in people around the globe. This is due to
A. the fact that HIV targets T cells. B. the fact that HIV inserts its genome into the host genome. C. both cellular and antibody-mediated responses. D. HIV's high rate of mutation. E. the fact that most people do not die from HIV infection.