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Table 1 The gametic output of an autotetraploid with two alleles A and a, where α is the coefficient of double reduction

From: A Brief History of the Impact of Potato Genetics on the Breeding of Tetraploid Potato Cultivars for Tuber Propagation

Genotypes   Gametes   
  AA Aa aa Divisor
AAAA 1 - - 1
AAAa 2 + α 2(1—α) α 4
AAaa 1 + 2α 4(1 – α) 1 + 2α 6
Aaaa α 2(1—α) 2 + α 4
aaaa - - 1 1