A mutation in the SHH gene may cause which of the following?
A. Anencephaly
B. Chiari Formations
C. Holoprosencephaly
D. Schizencephaly
E. Spina Bifida
Answer: C. Holoprosencephaly
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Once species have formed, they keep their identity by
A. developmental differences. B. genetic blocks. C. isolating mechanisms. D. somatic mutations. E. structural modifications.
Exposure to light redistributes auxin to the opposite side of the stem or root that is exposed to light. In stems, this redistribution of auxin results in the stem growing and bending toward the light
In contrast, roots bend away from the light as they grow. What may be an advantage of the difference in bending of roots and stems? A. When stems bend toward the light as they grow, the leaves will shade the stem and keep it from getting too hot. B. When roots grow away from the light, they will grow deeper into the soil where they can absorb water and nutrients. C. When roots grow away from the light, the root cap will not be lost. D. When roots grow away from the light, light sensitive statoliths drive the bending of the cells back to the ground.
The dominant stage in the life cycle of tracheophyte plants is the
A. epiphyte generation. B. sporophyte generation. C. spore generation. D. gametophyte generation. E. angiosperm generation.
What unit of physical distance between genes on a chromosome provides a convenient way to relate the recombination frequencies for linked genes with their positions and order along a chromosome?
What will be an ideal response?