What is a major advantage of using a modifier screen as opposed to a primary screen?
A) Modifier screens can be used to identify pleiotropic genes.
B) Modifier screens are easier to perform.
C) Modifier screens use a random selection of flies based on their morphology and therefore should identify all genes involved in development.
D) Modifier screens are performed with chemically mutagenized flies so all genes that affect development should be identified more rapidly than screening for spontaneous mutants.
A) Modifier screens can be used to identify pleiotropic genes.
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Which fungi are responsible for infecting hundreds of plant species and cause the loss of millions of pounds of produce each year?
A. Tobacco mosaic virus B. Agrobacterium tumefaciens C. White and Grey mold fungus D. Cryphonectria parasitica, which also causes chestnut blight.
A fungus would be most likely to infect:a
skin. b. blood. c. bone. d. muscle. e. connective tissue.
Sexual intercourse cannot result in pregnancy prior to the middle of the proliferative stage. Explain why
What will be an ideal response?
A protist such as Chlamydomonas may switch to sexual reproduction when:
A) there is little nutrition. B) hormones from nearby members of the species are detected. C) there are numerous predators. D) a 90-day cycle is completed.