What conclusion can be drawn about the genetic structure of an organism if, during the analyzing crossing, two types of offspring are formed in a 1: 1 ratio.
Analyzing crossing is carried out in order to determine the genotype. The organism under study is crossed with an organism homozygous for a recessive trait (analyzer) and, according to the phenotype of the offspring, they pretend to be the genotype of the organism under study.
In order for two species of offspring to be formed in a 1: 1 ratio, the genotype of the organism under study must be Aa.
The scheme of such a crossing:
P: Aa (tested organism) x aa (analyzer);
G: A, a x a;
F1: Aa, aa.
Distribution by genotype 1: 1, which corresponds to the condition. The genetic structure of the organism is Aa (heterozygous).
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