Chromosomal Abnormalities

A person with Turner syndrome has ____ sex chromosome(s).

• zero

• one

• two

• three

A Barr body is a condensed, inactive X chromosome.

• True

• False

XX

• Female

• Male

The sex of a newborn child is determined by the ____.

• mother

• father

• both mother and father

How many pairs of homologous chromosomes are found in each (body) cell?

• 46

• 23

• 72

• 10

Normally, an individual receives two sex chromosomes from a parent.

• True

• False

If a segment of a chromosome is turned around 180 degrees, it results in ____.

• an inversion.

• a translocation.

• a delection.

• a duplication.

Monosomy:

• Missing 1 chromosome

• 3 chromosomes (instead of a pair)

• Chromosomes are normal

If a segment of a chromosome is present several times more than normal due to unequal crossing-over, it is called ____.

• an inversion.

• a translocation.

• a delection.

• a duplication.

Persons with Down syndrome typically have how many copies of chromosome 21?

• none

• one

• two

• three