Suppose That You Examine a Vial of 100 Flies That

question 65

Multiple Choice

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and you find only red-eyed females and red-eyed males present. You allow these flies to interbreed, and in the next generation you find all the females are red-eyed, but you find both red-eyed and white-eyed males. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w) . Which of the following best describes the genotypes of the original parents?

• A) X^w+X^w+; X^wY
• B) X^w+X^w; X^w+Y
• C) X^w+X^w; X^wY
• D) X^wX^w; X^w+Y

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Definitions:

Hydrophobic

Characteristic of molecules that repel water or do not mix well with water, often due to nonpolar properties.

Alkanes

Hydrocarbons consisting solely of hydrogen and carbon atoms arranged in straight or branched chains without any double or triple bonds.

Cis/trans Designation

A way to distinguish isomers by the relative positioning of functional groups within a molecule; cis means on the same side and trans means on opposite sides.

Compound

A substance formed by the chemical combination of two or more elements in a fixed ratio.