In Rabbits,genes T and R Are Located on the Same

question 29

Multiple Choice

In rabbits,genes T and R are located on the same chromosome,20 map units apart.A colleague sends you one of his pure-breeding t r/t r males,which you cross to a T R/T R individual.Each of the T R/ t r F₁ heterozygotes is then crossed back to your colleague's double homozygous recessive.Altogether,the backcrosses produce 50 rabbits,of which 24 are T R/t r,24 are t r/t r,1 is T r/t r and 1 is t R/t r. Which of the following explanations best justifies the results?

• A)The colleague's rabbit is heterozygous for an inversion that spans at least 16 map units of the region between genes t and r.
• B)The colleague's rabbit is heterozygous for an inversion that spans at least 18 map units of the region between genes t and r.
• C)The colleague's rabbit is homozygous for an inversion that spans at least 16 map units of the region between genes t and r.
• D)The colleague's rabbit is homozygous for an inversion that spans at least 18 map units of the region between genes t and r.
• E)The colleague's rabbit carries an inversion that spans the whole region between genes t and r.

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