If a color-blind (X-linked recessive trait) man marries a woman who is heterozygous for the trait, what proportion of their male offspring can be expected to be color blind?
A) 1/2
B) 1/4
C) 1/8
D) 3/4
E) 100 (all)
A
You might also like to view...
The photoreceptors in the retina that detect light are ________
A) rods and cones B) ganglion cells C) horizontal and amacrine cells D) bipolar cells
Which is not true about the periosteum?
A. It includes two layers: outer fibrous and inner cellular. B. It is composed of dense regular connective tissue. C. It provides stem cells for bone growth and repair. D. It is anchored to the bone by collagen fibers. E. It covers the entire bone surface, with the exception of articular areas.
Matching
A) Paget's disease B) Osteoporosis C) Osteomalacia 12) Bones are porous and thin but bone composition is normal. 13) Bone formed is poorly mineralized and soft. Deforms on weight bearing. 14) Excessive and haphazard bone deposit and resorption.
In relationship to the diaphysis of a long bone, the osteons are
A) radial. B) anterior. C) parallel. D) proximal. E) diagonal.