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Which of the following will be pure breeding for only one character?

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Which of the following will be pure breeding for only one character?

(a) Hh Rr

(b) HH Rr

(c) HH RR

(d) hh rr

I got this question in an interview for job.

My query is from Dihybrid Cross in chapter Mendelian Genetics of Cytogenetics

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The correct option is (b) HH Rr

To explain: In this case of HH Rr it will be true breeding for H locus but as it is heterozygous for R locus, R character will not breed true. On the other hand HH RR and hh rr will breed true for both the H and R characters.

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