In Loppins (Small,diploid Invertebrates),chocolate-Dependent Problem-Solving Ability Is an Autosomal Recessive

question 63

Multiple Choice

In loppins (small,diploid invertebrates) ,chocolate-dependent problem-solving ability is an autosomal recessive trait.You have been hired to map the position of the gene controlling this phenotype (called "lu") using two SSLP markers (called "A" and "B") .You first cross two pure-breeding loppins:

lu⁺A^{[3 repeats]} B^{[5 repeats]}/lu^+-A^{[3 repeats]} B^{[5 repeats]} X lu^- A^{[6 repeats]} B^{[8 repeats]}/lu^-A^{[6 repeats]} B^{[8 repeats]}
The F₁ is then crossed back to the lu^-/lu^- parent.Which of the following results would indicate that the lu gene is much closer to SSLP "A" than to SSLP "B"?

• A)lower proportion of A^{[3 repeats]}B^{[5 repeats]}/A^{[3 repeats]}B^{[5 repeats]} than A^{[3 repeats]}B^{[8 repeats]}/A^{[3 repeats]}B^{[5 repeats]} individuals
• B)lower proportion of lu⁺A^{[3 repeats]}/lu^-A^{[6 repeats]} than lu⁺A^{[3 repeats]}/lu^-A^{[3 repeats]} individuals
• C)lower proportion of lu⁺A^{[3 repeats]}/lu^-A^{[6 repeats]} than lu⁺A^{[6 repeats]}/lu^-A^{[6 repeats]} individuals
• D)lower proportion of lu⁺A^{[6 repeats]}/lu^-A^{[3 repeats]} than lu⁺B^{[8 repeats]}/lu^-B^{[8 repeats]} individuals
• E)lower proportion of lu⁺A^{[6 repeats]}/lu^-A^{[6 repeats]} than lu⁺B^{[8 repeats]}/lu^-B^{[8 repeats]} individuals

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