NEET 2010 Biology question

The genotype of a plant showing the dominant phenotype can be determined by

(1)Dihybrid cross
(2)Pedigree analysis
(3)Back cross
(4)Test crossCorrect

Answer: (4)

Solution

A test cross is a cross of an organism showing the dominant phenotype (genotype unknown, homozygous or heterozygous) with the homozygous recessive parent. If all the progeny show the dominant phenotype, the unknown genotype is homozygous; if the progeny segregate 1:1, it is heterozygous. So (4)

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Question ID VK-090649