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In case of rats the homozygous yellow allele is lethal. If you cross two yellow pats, what will be the ratio of white and yellow rats?(a) 1:2:1(b) 3:1(c) 2:1(d) 1:1This question was addressed to me during a job interview.This intriguing question originated from Numerical Problems in chapter Mendelian Genetics of Cytogenetics

Answer»

The correct ANSWER is (C) 2:1

The explanation: Homozygous yellow rat YY is lethal, so the parent MUST be heterozygous Yy. Now, the living PROGENIES will be Yy and yy i.e. yellow and white in the ratio 2:1 and YY will be lethal.



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