Mendel's Law of Segregation is supported by a 1:1 testcross ratio.

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Mendel's Law of Segregation states that during gamete formation, the two alleles of a gene separate from each other so that each gamete receives only one allele. This results in a 1:1 ratio of offspring with different genotypes when a heterozygous parent is crossed with a homozygous recessive parent (testcross). Therefore, the law is supported by a 1:1 testcross ratio.

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