NEET 2010 Biology question
A cross in which an organism showing a dominant phenotype is crossed with the recessive parent in order to know its genotype is called
Answer: (4)
Solution
A test cross is the cross of an individual showing the dominant phenotype (genotype unknown, homozygous or heterozygous) with the homozygous recessive parent. If all progeny show the dominant trait the unknown individual is homozygous; a 1 : 1 ratio of dominant : recessive
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