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In a monohybrid cross, 2 heterozygous individuals were crossed, phenotypic ratio came to be (2:1), it is due to__________________?

In a monohybrid cross, 2 heterozygous individuals were crossed, phenotypic ratio came to be (2:1), it is due to__________________?

A. Dominant lethal genes in heterozygous individuals
B. Dominant lethal genes in homozygous individuals
C. Dominant epistasis
D. None of the above