Author Question: Chromosomes are composed of genes, which are composed of DNA. Abnormalities are either numerical or ... (Read 161 times)

jake · **on:** Jun 27, 2018

Chromosomes are composed of genes, which are composed of DNA. Abnormalities are either numerical or structural in nature. Which abnormalities are structural? Select all that apply.

a. Part of a chromosome is missing.
b. The material within a chromosome is rearranged.
c. One or more sets of chromosomes are added.
d. Entire single chromosome is added.
e. Two chromosomes adhere to each other.

Question 2

The fetal heart rate baseline increases 15 beats per minute after vibroacoustic stimulation. The best interpretation of this is that the fetus is showing

a. A reassuring response
b. Progressive acidosis
c. Parasympathetic stimulation
d. A worsening hypoxia

kxciann · **Reply #1 on:** Jun 27, 2018

Answer to Question 1

A, B, E
Feedback
Correct It is critical to remember that characteristics of structural abnormalities
include part of a chromosome missing or added, rearrangement of material
within chromosomes, two chromosomes that adhered to each other, and
fragility of a specific site on the X chromosome.
Incorrect The addition of a single chromosome (trisomy), the deletion of a single
chromosome (monosomy), and one or more added sets of chromosomes
(polyploidy) are numerical abnormalities.

Answer to Question 2

A
Feedback
A The fetus with adequate reserve for the stress of labor will usually respond to
vibroacoustic stimulation with a temporary increase in the fetal heart rate (FHR)
over baseline of 15 bpm for 15 seconds or more.
B An increase in the FHR after stimulation is reassuring.
C An increase in the FHR after stimulation is a reassuring pattern and does not
indicate problems with the parasympathetic nervous system.
D An increase in the FHR with stimulation does not indicate hypoxia.