0 Monozygotic twins (= two babies born to the same mother at the same time) develop from just one egg. --
It tends to cluster in families and have a modest (36%) concordance rate in monozygotic twins.
They found that only for games that involved heavy player promotion and high payoffs, male monozygotic twins were similar in their frequency of gambling.
Monozygotic twinning rates have shown no similar trend so that pregnancy wastage does not seem to be implicated.
Except for monozygotic twins, each person in the population has a unique genotype.
However, while there is little variation in the monozygotic twinning rates in most of the regional groups, the dizygotic twinning rates vary considerably.
Of the complete pairs, 3269 pairs were monozygotic, 9010 pairs dizygotic, and 128 pairs of unknown zygosity.
Therefore, monozygotic twins should be concordant for inherited traits approximately twice as often as dizygotic twins.
If both members of a pair responded "almost always," "always," or "often," they were classified as monozygotic.
