A Testcross of Trihybrid Drosophila Produced the Following Phenotypes and Number

question 31

Multiple Choice

A testcross of trihybrid Drosophila produced the following phenotypes and number of offspring. A table showing phenotype and the number of offspring with each phenotype is below. A plus sign is used for wild-type phenotype; a letter indicates the mutant phenotype for that gene. $\begin{array} { l r } + + + & 669 \\a b c & 653 \\+ + c & 121 \\a b + & 139 \\+ b + & 2280 \\a + c & 2215 \\+ b c & 3 \\a + + & 2\end{array}$
-The cross represented by a^+b+c+/abc × abc/abc is

• A)a two-point testcross.
• B)a three-point testcross.
• C)a parental cross.
• D)a haploid cross.
• E)None of these

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