<P> Generally , the monohybrid cross is used to determine the dominance relationship between two alleles . The cross begins with the parental ( P ) generation . One parent is homozygous for one allele , and the other parent is homozygous for the other allele . The offspring make up the first filial ( F1 ) generation . Every member of the F1 generation is heterozygous and the phenotype of the F1 generation expresses the dominant trait . Crossing two members of the F1 generation produces the second filial ( F2 ) generation . Probability theory predicts that three quarters of the F2 generation will have the dominant allele 's phenotype . And the remaining quarter of the F2s will have the recessive allele 's phenotype . This predicted 3 : 1 phenotypic ratio assumes Mendelian inheritance . </P>
<P> Generally , the monohybrid cross is used to determine the dominance relationship between two alleles . The cross begins with the parental ( P ) generation . One parent is homozygous for one allele , and the other parent is homozygous for the other allele . The offspring make up the first filial ( F1 ) generation . Every member of the F1 generation is heterozygous and the phenotype of the F1 generation expresses the dominant trait . Crossing two members of the F1 generation produces the second filial ( F2 ) generation . Probability theory predicts that three quarters of the F2 generation will have the dominant allele 's phenotype . And the remaining quarter of the F2s will have the recessive allele 's phenotype . This predicted 3 : 1 phenotypic ratio assumes Mendelian inheritance . </P>
the first generation in a series of monohybrid crosses is referred to as the -- -- -- generation
the first generation in a series of monohybrid crosses is referred to as the -- -- -- generation
first filial
first filial