Mendel's Law of Segregation is supported by a 1:1 ratio of offspring when one parent is heterozygous and the other is homozygous recessive.

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Mendel's Law of Segregation states that alleles segregate independently during gamete formation, resulting in a 1:1 ratio of offspring when a heterozygous parent (Aa) is crossed with a homozygous recessive parent (aa), producing offspring genotypes of Aa and aa.

Mendel's Law of Segregation Is Supported by a 1:1 Ratio