Down syndrome is a condition in which the individual has which chromosome?
a. 3 copies of chromosome 23
b. 3 copies of chromosome 21
c. lacks chromosome 46
d. has only one chromosome 21

Color blindedness is a sex-linked trait. if we could see the pedigree chart for several more generations of the family illustrated here, we would expect a) more males to be color blind. eliminate b) more females to be color blind. c) no females to ever be color blind. d) an equal number of males and females that are color blind.

When mitochondrial dna from living relatives was compared with mitochondrial dna from the skeletons, scientisits determined that skeletons 3,4,5,6 and 7 were members of the romanov family. which of these skeletons can be identified by name based on the evidence you have? explain your answer.

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false