Fragile X syndrome

a. is caused by too many X chromosomes on a gene.
b. is similar to Lesch-Nyhan syndrome

Research shows that among MZ twins, ADHD is highly heritable,

a. however, studies fail to specify exactly how either genes or environment bring it on. b. so it is clear that ADHD is genetically transmitted on recessive alleles. c. so it is clear that certain parenting styles, such as lack of discipline, lead to the development of ADHD. d. so it is clear that ADHD recessive genes combined with certain parenting styles, such as lack of discipline, is what causes ADHD. e. however, certain parenting styles, such as lack of discipline, outweigh genetic influences in the development of ADHD.

For Freud, the seething cauldron of unconscious urges and desires continuously seeking expression is the ______

a. id c. superego b. ego d. persona