Day 49 : hereditary

If both parents are left handed, 50% of their offspring will be left-handed. Two righties only have a 2% chance of having a lefty. Given that information, what is the equation for Kelly’s family? Kelly and her brother are left-handed, both parents are right-handed. (Coincidentally, Kelly’s adopted son is left-handed. What are the odds?)


Kelly: My 7 year old is learning to read and write on his own this year in school. When he was a baby he automatically used his left hand to eat but would do other things right handed and/or left handed (throw, draw, kick balls). It wasn’t until kindergarten or so that he was a pretty much always a lefty. The left (lighter) “plant of the sun” (we’re working on spelling but he worked on his own w/o “help”) he did with his RIGHT hand and the right (darker) side and bottom word with his LEFT. He said he had to use more pressure and it felt a little weird to write with his right. He really likes tennis and baseball so being a lefty could be an advantage for him.

Friend facts: RundiH is left-handed as is her mother and grandmother. NancyL is ambidextrous, her sister and niece are left-handed. EliC is left-handed, his grandmother and aunt are, too. KennyT and his son are left-handed. NoelS writes and paints left-handed. NoelS’s son and daughter are left-handed. NoelS’s brother is left-handed but their sister is right-handed.

Sandy’s year long journey – going from being a right-hander to left-hander, and Kelly’s parallel trip as a left-hander doing things as a right-hander.


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