Mutating the gene Transformer (tra) in Drosophila that is chromosomally XX leads to the development of only males. Explain
What will be an ideal response?
In nonmutated fertilized eggs that are supposed to develop into females (XX), the two copies of SXL causes the expression of tra, which then leads to an alternative splicing pathway of the dsx gene that induces female development. However, even though sxl is present at levels to cause female development (because of the two X chromosomes), only males form because the SXL target is tra. If tra is not expressed or mutated, then males will form due to the alternative splicing of dsx that leads to male development.
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(a) ask a question. (b) construct a hypothesis. (c) observe carefully. (d) formulate a prediction.
Animal cells commonly have polysaccharides attached to ____ in their surface membranes
a. proteins b. nucleic acids c. lipids d. both nucleic acids and lipids e. both proteins and lipids
Which of the following processes generates a continuum (spectrum) of varying phenotypes?
A) Pleiotropy B) Polygenic inheritance C) Epistasis D) Single-gene traits
Which of the following statements about bright field microscopy are true?
A) Bright field microscopy is great for seeing living samples. B) Dark field, phase contract, and differential interference contract microscopy are better for observing dead samples. C) Bright field microscopy is able to see specimens without natural coloration. D) Bright field microscopy is the simplest and most common form of microscopy. E) Bright field microscopy has the sample appear as a brighter contrasting image on a dark background.