A Geneticist Is Mapping the Chromosomes of the Newly Captured

question 52

Multiple Choice

A geneticist is mapping the chromosomes of the newly captured gremlin. Stripe is heterozygous for linked genes with alleles Bb, Ee, and Hh that determine if gremlins have biting teeth (B) , are evil (E) , have hair (H) . In order to determine if the three genes are linked, a standard testcross was done, and 1000 offspring had the following genotypes: $$\begin{array} { l l } 48 & \text { bb ee } \mathrm { Hh } \\36 & \text { Bb ee hh } \\400 & \text { Bb ee } \mathrm { Hh } \\4 & \text { Bb Ee Hh } \\426 & \text { bb Ee hh } \\46 & \text { Bb Ee hh } \\38 & \text { bb Ee Hh } \\2 & \text { bb ee hh }\end{array}$$ What is the recombination frequency between genes E and B?

• A) 9.0%
• B) 8.4%
• C) 42.6%
• D) 10.0%
• E) 9.4%

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