Three mouse research labs independently identify three tailless mutants. Researc

Question

Three mouse research labs independently identify three tailless mutants. Researchers from each lab cross their mutant to normal tailed mice, and in each of the three crosses, the offspring are all normal. Each of the three labs then mates two of the offspring from this cross, and obtain 25% tailless offspring and 75% tailed offspring. Each lab mates the tailless mice so that three different lines (A, B, and C) of tailless mice are produced. In another laboratory, animals from each line are crossed. Line A x Line B produces offspring with tails; Line B x Line C produces offspring with tails; Line A x Line C produces tailless offspring. Analyze these data and indicate which statement is true. Answer Each line has a mutation that affects a different gene. Lines A and C have mutations in different genes. Lines B and C affect the same gene. Two genes are affected by the three mutations.

Explanation / Answer

Line A has recessive gene "t" Line B has Dominant gene "T" Line C has recessive gene "t" Statement 1) is true i.e., Each line has a mutation that affects a different gene...

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