Which of the following statements concerning Down syndrome is FALSE?

a. Down syndrome involves nondisjunction.
b. Down syndrome individuals have 47 chromosomes per somatic cell.
c. Down syndrome incidence increases with increasing material age.
d. Down syndrome individuals have an extra chromosome 22.
e. Down syndrome is variable in expression.


D

Biology & Microbiology

You might also like to view...

An interaction that benefits both participants is called a ____

Fill in the blank with the appropriate word.

Biology & Microbiology

Which organism is catalase positive, coagulase negative, pyrrolidonyl arylamidase (PYR) positive, susceptible to novobiocin, urease negative, and hemolytic on sheep blood agar?

a. S. epidermidis b. S. saprophyticus c. S. cohnii d. S. haemolyticus

Biology & Microbiology

Which lineage of Cnidarians exist primarily as cube-shaped medusae, are active swimmers, and produce one of the deadliest toxins made by animals?

a. Hydrozoa b. Trematoda c. Cubozoa d. Anthozoa

Biology & Microbiology

Special molecules such as NADH and FADH2 transport ________ in cells, which can then be used as energy in the cell

Fill in the blank(s) with correct word

Biology & Microbiology