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Term for the existence of different characteristic variants (alleles) at the same gene locations of homologous chromosomes. A characteristic under consideration occurs twice in a double set of chromosomes and often in two different variants in the grapevine. In relation to all grapevine varieties, however, a certain characteristic can exist in up to 30 different variants, whereby in a grapevine plant only two of the possible alleles are realized at one gene locus at any one time. In sexual reproduction, only one single set of chromosomes is passed on per parent. In the vine this is realized by germination of a fertilized seed of the berry to a plant. Which of the two homologous chromosomes of a parent is passed on is decided by chance with a 50:50 chance. Together with half the chromosome set of the second parent, the embryo again has a complete but newly mixed chromosome set with only half of the maternal alleles, but enriched by the new paternal alleles. This is also called mixed, split, uneven or unequal inheritance of the fertilised egg.

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26,121 Keywords · 46,882 Synonyms · 5,323 Translations · 31,455 Pronunciations · 188,555 Cross-references
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