曼基康猫之所以有长腿，原因在于矮脚是显性遗传。这样，它们的后代不太可能全都拥有矮脚，而更多地会出现长腿的小猫。尽管如此，两只矮脚的曼基康或是与长腿曼基康交配，都有可能生下一只长腿的小猫。但要注意的是，这些长腿的曼基康并不能成为竞赛级别。

由于矮脚表现为显性特征，即便两只母猫都是短腿的，也不适合进行繁殖，因为这可能导致双重显性遗传，使得胚胎在孕育过程中被消化掉，从而无法找到具有双重显性遗传基因的短腿小猫。

因此，由于试管胚胎消失的问题，纯合子繁殖是不现实的，因此曼基康所生的后代也不会完全都是短肢。然而，将曼基康与其他拥有长肢种类混合繁殖，则可以产生带有这种特征的小猫。而且，即使是短肢和长肢均来自曼基康之间繁衍出的后代，也仍然有机会产下一个拥有较高身高的小猫。不过需要指出的是，这些满足条件但尚未达到比赛标准的大型犬并非可作为竞技动物。

此外，若以不同的方式来表述上述内容：

长 legs on Manx cats: The reason behind this is the visible expression of dwarfism as a dominant gene, resulting in their offspring less likely to have short legs and more prone to inheriting longer limbs. Despite this, breeding two dwarf Manx cats or pairing them with a long-legged counterpart can still yield kittens with extended limbs.

However, it's worth noting that these tall felines are not eligible for competition due to specific regulations.

Furthermore, since dwarfism exhibits itself as a dominant trait, even when both parents are short-legged Manx cats, they shouldn't be bred together lest they produce embryos that get consumed during pregnancy due to double recessive inheritance – rendering such kittens impossible to find.

Consequently, purebred reproduction isn't feasible for the Manx cat owing to embryo loss; thus their offspring will never consist entirely of dwarfs either.

Yet cross-breeding between different types of long-legged breeds and the Manx can result in taller-than-usual kittens from their litters – though only 50% chance if crossed with another short-limbed breed and 66% if paired with an equally short-limbed partner within its own kind.

Nonetheless, despite being ineligible for competitive purposes due to size requirements alone (unlike those born from other breeds), these otherwise impressive specimens remain lovable companions nonetheless!