in Fundamentals of Genetics by

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Dihybrid F1 generation are produced in dihybrid crosses. In dihybrid crosses 2 pairs of traits are studied. F1 generation are heterozygous (consisting of two different alleles of same gene where one is dominant and other is recessive) for two pairs of traits. Such offsprings are called dihybrids and cross between these dihybrids are called dihybrid cross.