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If the parents are both right-handed, in dizygotic and monozygotic twins there is a 21% chance of one being left-handed. If one parent is left-handed, in DZ and MZ twins there is a 57% chance of one being left-handed. If both parents are left-handed, it is almost certain one twin will be left-handed. [citation needed]
Handedness displays a complex inheritance pattern. For example, if both parents of a child are left-handed, there is a 26% chance of that child being left-handed. [23] A large study of twins from 25,732 families by Medland et al. (2006) indicates that the heritability of handedness is roughly 24%. [24]
Handedness in and of itself tends to be a grey area. The requirements for someone to be right- as opposed to left-handed have been debated, and because individuals who identify as left-handed may also use their right hand for a large number of tasks, identifying two clearcut groups of subjects is a challenging task.
One left handed, one right. Etc. Image credits: MontEcola #5. My wife is an identical twin. When we first started dating I could tell them apart from their voices, smell, makeup, and eyes ...
One theory, known as the acoustic laterality theory, the physical properties of certain speech sounds are what determine laterality to the left hemisphere. Stop consonants , for example t, p, or k, leave a defined silent period at the end of words that can easily be distinguished.
Left-handed people, who account for roughly 10% of the world's population, experience distinct challenges, benefits, and quirks of daily life that most right-handed people usually never even consider.
The Twins Early Development Study (TEDS) is an ongoing longitudinal twin study based at King's College London.The main goal of TEDS is to use behavioural genetic methods to find out how nature and nurture (environments) can explain why people differ with respect to their cognitive abilities, learning abilities and behaviours.
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