In Drosophila, the gray color of the body dominates over the black, normal wings – over the curved ones. Two gray flies with normal wings are crossed. F1 offspring are phenotypically uniform – with a gray body and normal wings. What are the possible genotypes of crossed individuals and offspring?
Let’s designate dominant and recessive alleles of genes: A – gray body, a – black body, B – normal wings, b – rudimentary wings. Crossed flies can have the following genotype variants: both flies are homozygous (AABB), then the genotype of the offspring is AABB; one fly is homozygous (AABB), the other is diheterozygous (AaBb) or one fly is homozygous for the first trait, but heterozygous for the second (AABb), and the other is heterozygous for the first, but homozygous for the second trait (AaBB), then the genotype of the offspring AABB, AABb, AaBB, AaBb in a ratio of 1: 1: 1: 1.
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