Apple is diploid (though triploid cultivars are not uncommon), has 17 chromosomes and an estimated genome size of approximately 650 Mb. Several whole genome sequences have been made available, the first one in 2010 was based on the diploid cultivar ‘Golden Delicious’.[13] However, this first whole genome sequence turned out to contain several errors[14] in part owing to the high degree of heterozygosity in diploid apples which, in combination with an ancient genome duplication, complicated th...