Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 2

The zygosity of F1 generation can be checked by test cross method. In a test cross :
The organism with the dominant trait is always crossed with an organism with the recessive trait. If any offspring show the recessive trait, the unknown genotype is heterozygous.If all the offspring have the dominant trait, the unknown genotype is homozygous dominant.Large numbers of offspring are needed for reliable results.