In humans an extra copy of chromosome 21 typically leads to moderate to severe mental retardation
and sterility, as well as a greater likelihood of heart defects and other problems. This disorder is known
as ____.
a. Turner syndrome
b. Down syndrome
c. cri-du-chat
d. Triple-X syndrome
e. Klinefelter syndrome
B
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Which part of a plant cell 'captures' the photons of light for photosynthesis?
The trigger for a fixed action pattern is called the ____
Fill in the blank with the appropriate word.
A nearsighted woman (Nn) with hazel eyes (Hh) marries a man with normal vision and hazel eyes (Hh). Their three children all have blue eyes and normal vision. What is the probability that their next child will have blue eyes and be nearsighted?
A. 1/4 B. 1/2 C. 3/8 D. 1/8 E. 5/8
The regulatory systems of the animal body maintain a relatively stable internal condition through a process called ____________________.
A. equilibrium B. absorption C. osmoreception D. homeostasis E. countercurrent exchange