Homeotic genes contain a homeobox sequence that is highly conserved among very diverse species. The homeobox is the code for that domain of a protein that binds to DNA in a regulatory developmental process. Therefore, you would expect that _____
A) homeotic genes are selectively expressed as an organism develops
B) homeoboxes cannot be expressed in nonhomeotic genes
C) homeotic genes in apes and humans are very different
D) all organisms must have homeotic genes
A
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Ecdysis is:
A. development of the ectoderm layer in the gastrula B. development of the epidermis from the ectoderm C. disintegration of the ectoderm D. molting E. the feeding tentacles of the Ecdysozoa
Throughout a growing season, a plant uses up to 1000 liters (or kg) of water to produce just 1 kilogram of tissue. What happens to most of the remaining 999 kg of water?
A. It is used in the cytoplasm. B. It is used in photosynthesis. C. It is used in hydrolysis reactions. D. It evaporates. E. It passes back through the roots into the soil.
With __________, an animal learns to associate an involuntary response to one stimulus with another
stimulus. Fill in the blank(s) with the appropriate word(s).
What is the evolutionary advantage of extra-pair copulations in birds?
A. For males, the chance to have other females (thought to be the sisters of the mates) assist with the rearing of the offspring and for females, increased reproductive success. B. For males, increased reproductive success and for females, the chance to mate with genetically superior individuals. C. For males, increased reproductive success and for females, the chance to have other females (thought to be the sisters of the mates) assist with the rearing of the offspring. D. For males, the chance to mate with genetically superior individuals and for females, increased reproductive success.