Down syndrome is caused by
a. a missing chromosome.
b. two X chromosomes.
c. an extra 21st chromosome.
d. the presence of an X and a Y chromosome.
Answer: c. an extra chromosome.
Psychology
You might also like to view...
When adolescents refer to "popular kids," they are referring to kids who:
A) are well liked by others. B) have a lot of friends. C) are socially dominant leaders. D) all of the above
Psychology
In adoption studies, if a behavior has genetic roots, adopted children should behave more like their biological parents than their adoptive parents
Indicate whether the statement is true or false
Psychology