You are studying tail length in a species of mice, where some mice have long tails and some have short tails. Preliminary results show that long tail is dominant, but you think the trait may be X-linked. Give the expected offspring phenotypic ratio for each cross if the trait is X- linked or if it is autosomal and answer the question at the end. Make sure your phenotypic ratio is labeled with the complete phenotype (all relevant details). Cross #1: true-breeding long-tailed male x true-breeding short tailed female • Expectation if X-linked? • Expectation if autosomal? Cross #2: true-breeding long-tailed female x true-breeding short tailed male • Expectation if X-linked? • Expectation if autosomal? Compare the four results listed above. Briefly, why is a reciprocal cross is necessary to determine X (or Z) linkage?
You are studying tail length in a species of mice, where some mice have long tails and some have short tails.
Preliminary results show that long tail is dominant, but you think the trait may be X-linked. Give the expected
offspring phenotypic ratio for each cross if the trait is X- linked or if it is autosomal and answer the question at
the end. Make sure your phenotypic ratio is labeled with the complete
Cross #1: true-breeding long-tailed male x true-breeding short tailed female
• Expectation if X-linked?
• Expectation if autosomal?
Cross #2: true-breeding long-tailed female x true-breeding short tailed male
• Expectation if X-linked?
• Expectation if autosomal?
Compare the four results listed above. Briefly, why is a reciprocal cross is necessary to determine X (or Z)
linkage?
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