Kaydon and Layton Richardson from United Kingdom born July 2006. Their mother, Kerry, said: ‘I was in America recently with my best friend, who is white and blonde. Everyone assumed that Layton was her son and Kaydon was mine.’
These schemes are a comprehensible oversimplification for easiness of explanation.
As you can see, mathematically and genetically, the balance between homozygous (50% MM+mm) and heterozygous (50% Mm) alleles is always maintaned, no matter what is the composition of both parental alleles (MM, mm or Mm). There are two exceptions (squares not pictured): crossing “pure” MM with “pure” mm , which produces 100% heterozygous Mm, but that lasts only one generation, because the heterozygous descendants will cross (pictured squares) and reintroduce the balance again; and crossing “pure” MM with “pure” MM, a closed system without variability that leads to vulnerabilities to several diseases (cf. haemophilia in European Royalty and infertility in Darwin-Wedgwood dynasty). Most, if not all, phenotypical characteristics are the result of a complex combination of many multiple different genes: more than 20 (AA-BB-CC-DD-EE-FF-GG-HH-II-JJ-KK-LL-MM-NN-OO-PP-QQ-RR-SS-TT or 20 Punnet squares, at least, perhaps even a Punnet square of 20 columns per 20 rows…) in the case of skin colour, for example.
In conclusion, the unscientific pranks that racial ideologues use to persuade folkloric minds is totally bullshit.