In cabbage, resistance to powdery mildew and fusarium jaundice is dominant, susceptibility is a recessive trait.

In cabbage, resistance to powdery mildew and fusarium jaundice is dominant, susceptibility is a recessive trait. A heterozygous plant resistant to powdery mildew and susceptible to fusarium jaundice, crossed with a heterozygous plant resistant to fusarium jaundice and susceptible to powdery mildew. Determine: 1) the genotype of the F1 offspring; 2) the phenotype of the offspring from the analyzing crossing of F1 hybrids.

Let’s designate the dominant and recessive alleles of genes: A – resistance to powdery mildew, a – susceptibility, B – resistance to fusarium jaundice, b – susceptibility.
1) Genotypes F1 – AaBb, Aabb, aaBb, aabb in a ratio of 1: 1: 1: 1, phenotypes – 1/4 plants resistant to powdery mildew and fusarium jaundice, 1/4 – resistant to powdery mildew and susceptible to fusarium jaundice , 1/4 – susceptible to powdery mildew and resistant to fusarium jaundice and 1/4 – susceptible to powdery mildew and fusarium jaundice;
2) a) genotypes of the offspring from the analyzing crossing of the F1 hybrid with the AaBb genotype – AaBb, Aabb, aaBb, aabb in a ratio of 1: 1: 1: 1, phenotypes – 1/4 of plants resistant to powdery mildew and fusarium jaundice, 1/4 – resistant to powdery mildew and susceptible to fusarium jaundice, 1/4 – susceptible to powdery mildew and resistant to fusarium jaundice and 1/4 – susceptible to powdery mildew and fusarium jaundice;
b) genotypes of the offspring from the analyzing crossing of the F1 hybrid with genotype Aabb – Aabb, aabb in a 1: 1 ratio, phenotypes – plants susceptible to fusarium jaundice, but half are resistant to powdery mildew, and the other half is susceptible to it;
c) the genotypes of the offspring from the analyzing crossing of the F1 hybrid with the aaBb genotype – aaBb, aabb in a ratio of 1: 1, phenotypes are plants susceptible to powdery mildew, but half are resistant to fusarium jaundice, and the other half is susceptible to it;
d) the genotype of the offspring from the analyzing crossing of the F1 hybrid with the aabb – aabb genotype, the phenotype – plants susceptible to powdery mildew and fusarium jaundice.

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