Hemophilia, color blindness, and Duchenne muscular dystrophy occur more often in males than females. Why?
A) These diseases develop due to the lack of estrogen and progesterone.
B) Since there is no matching gene on the Y chromosome, the traits are expressed more readily in males.
C) Testis-determining factor (TDF) causes these diseases.
D) These traits are carried only on the X chromosome and since there is no matching gene on the Y chromosome, the traits are expressed more readily in males.
E) These traits are carried only on the X chromosome.
D) These traits are carried only on the X chromosome and since there is no matching gene on the Y chromosome, the traits are expressed more readily in males.
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A) mitral valve B) tricuspid valve C) bicuspid valve D) right atrioventricular valve E) All of the answers are correct.
The cells in the following photomicrographs have been stained to show microtubules comprising the spindle apparatus. Identify the stage of mitosis in each:
What will be an ideal response?
The membrane covering the axon is called the ________
A) neurolemma B) myelin sheath C) axolemma D) white matter
The radius articulates with this condyle of the humerus
A) trochlea B) capitulum C) intercondylar fossa D) olecranon fossa