Heterozygosity

Term for the existence of different trait variants (alleles) at the same gene loci of homologous chromosomes. A trait occurs twice (diploid) in a double set of chromosomes and often occurs in two different variants in grapevines. In relation to all grapevine varieties, however, a particular characteristic can exist in up to 30 different variants, whereby only two of the possible alleles are realised at one gene locus in a grapevine. In sexual reproduction, only one single set of chromosomes is passed on per parent.

Vine

In the vine, this is realised by the germination of a fertilised seed of the berry into a plant (seedling). Which of the two homologous chromosomes of a parent is passed on is decided by chance in 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 the maternal alleles, but enriched by the new paternal alleles. This is also known as mixed, split, unequal or unequal heredity of the fertilised egg.

To read the full text, you must be a Premium Member of wein.plus. You are currently not logged in to wein.plus. Become a Premium Member or log in with your credentials .

Become a Premium Member of wein.plus

Voices of our members

I have great respect for the scope and quality of the wein.plus encyclopaedia. It is a unique place to go for crisp, sound information on terms from the world of wine.
Dr. Edgar Müller
Dozent, Önologe und Weinbauberater, Bad Kreuznach

Welcome back!

Heterozygosity

Vine

To read the full text, you must be a Premium Member of wein.plus. You are currently not logged in to wein.plus. Become a Premium Member or log in with your credentials .

Voices of our members

The world's largest Lexicon of wine terms.

EVENTS NEAR YOU