## Mapping, combining abilities, heritabilities and heterosis with 4x x 2x crosses in potato |

### From inside the book

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Page i

... particularly in potato, to map single genes with respect to the centromere or to

distinguish between first

(SDR) modes of 2n gamete formation when gene locations are known.

... particularly in potato, to map single genes with respect to the centromere or to

distinguish between first

**division restitution**(FDR) and second**division restitution**(SDR) modes of 2n gamete formation when gene locations are known.

Page 10

The consequences of 2n sporogenesis in heterozygous 2x parents are

genetically ascertained, most easily, in the 4x progeny of these 4x- 2x matings. It

is assumed that 2n gametes originate from either first

second ...

The consequences of 2n sporogenesis in heterozygous 2x parents are

genetically ascertained, most easily, in the 4x progeny of these 4x- 2x matings. It

is assumed that 2n gametes originate from either first

**division restitution**(FDR) orsecond ...

Page 41

Of these 25 diploid clones, 16 had been characterized by Ckwuagwu (1981) as

producing 2n pollen by first

the [ps/ps, Sy3-] genotype, and 9 by a first

...

Of these 25 diploid clones, 16 had been characterized by Ckwuagwu (1981) as

producing 2n pollen by first

**division restitution**with crossing-over (FDR-CO) withthe [ps/ps, Sy3-] genotype, and 9 by a first

**division restitution**mechanism without...

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### Contents

Genetic Mapping of Three Linked Genes | 34 |

Results | 78 |

Comparisons between 2x FDRCO and 2x FDRNCO | 94 |

2 other sections not shown

### Common terms and phrases

2n eggs 2n gamete formation 2x clones 2x crosses 2x FDR-CO 2x genotypes 2x level 2x parents 4x cultivars 4x progeny 4x x 2x centromere chromosome combining abilities coupling phase cytokinesis depending on frequency diploid distal locus division restitution dominance variance double crossovers double exchange tetrads endosperm epistasis epistatic estimates expressed as map FDR and SDR FDR or SDR form 2n gametes form 2n pollen Frequencies of parental frequency of single gametic series produced GCA variance genotypes in coupling haploid heterosis heterozygosity heterozygous heterozygous loci homozygous linked genes map units marketable tuber yield meiocytes mode of 2n periderm Phureja ploidy polyploidization potato progenies from 4x proximal locus random chromatid exchange repulsion phase rH rH S. J. Peloquin SDR mode SET.I single and double single exchange tetrads Solanum Solanum tuberosum specific gravity Table tetrad analysis tetraploid total tuber yield tuber shape types of 2n unpigmented